Document:

<PAGE>
                                                                   EXHIBIT 10.19

                             SHAREHOLDER AGREEMENT

    SHAREHOLDER AGREEMENT dated as of March 27, 2001, among the person(s)
identified as Shareholder on the signature page hereof ("SHAREHOLDER"),
Infonautics, Inc., a Pennsylvania corporation (the "COMPANY"), and Tucows Inc.,
a Delaware corporation ("Tucows").

    WHEREAS, on or about the date of the execution and delivery of this
Agreement, certain parties are entering into an Agreement and Plan of Merger
(the "MERGER AGREEMENT"), which contemplates a business combination between
Tucows and the Company in a merger transaction to be accomplished through, as
currently contemplated and as may be modified by the parties thereto, (i) the
formation of TAC Acquisition Corporation ("TAC") and (ii) the merger of Tucows
with and into TAC (the "MERGER");

    WHEREAS, Shareholder is the beneficial owner of record of approximately
1,456,154 shares of Class A Common Stock of the Company (the "Class A Shares,"
and any other shares of common stock or other voting equity securities of the
Company held of record from time to time by the Shareholder, collectively the
"Subject Securities");

    WHEREAS, as a condition to Tucows' willingness to enter into the Merger
Agreement, the Company and Tucows are obtaining this Agreement;

    WHEREAS, the Shareholder deems it in the best interest of the Company for
the Company to enter into the Merger Agreement; and

    WHEREAS, in order to induce Tucows to enter into the Merger Agreement and to
agree to the covenants and agreements set forth therein, Shareholder has agreed
to enter into this Agreement.

    NOW, THEREFORE, to induce Tucows to enter into, and in consideration of its
entering into, the Merger Agreement, and for other good and valuable
consideration the receipt and sufficiency of which are hereby acknowledged by
the parties, and in consideration of the premises and the representations,
warranties and agreements herein contained, and intending to be legally bound,
the parties agree as follows:

        1.  RESTRICTION ON TRANSFER OR ACQUISITION OF SUBJECT
    SECURITIES.  Except as otherwise specified in Exhibit A hereto, Shareholder
    shall not (a) sell, transfer, pledge, assign or otherwise dispose of, or
    enter into any contract, option or other arrangement or understanding with
    respect to the direct or indirect sale, transfer, pledge, assignment or
    other disposition of, any of the Subject Securities to any person other than
    to Tucows, Company or any designee of Company, (b) deposit any of the
    Subject Securities into escrow, a voting trust or a voting agreement or
    grant a proxy with respect to any such Subject Securities, except as
    provided in this Agreement, or (c) acquire any additional securities of the
    Company without the prior written consent of Company.

        2.  VOTING AGREEMENT.  Shareholder agrees that, at any annual or special
    meeting of the shareholders of the Company and in any action by written
    consent of the shareholders of the Company, Shareholder shall vote the
    Subject Securities (a) in favor of the Merger, the approval and adoption of
    the Merger Agreement and all agreements related to the transactions
    contemplated by the Merger Agreement, and any actions related thereto, and
    (b) against any action or agreement which would result in a breach of any
    representation, warranty or covenant of the Company in the Merger Agreement
    or which would otherwise frustrate the purposes of, impede, interfere with
    or attempt to discourage the Merger, including without limitation any other
    merger, consolidation, sale of assets, reorganization, recapitalization,
    liquidation or winding up of the Company or any other extraordinary
    transaction involving the Company or any matters related to or in connection
    therewith. On the date hereof, the Shareholder shall sign and deliver to
    Company the proxy in the form set forth in Exhibit B hereto (the
    "IRREVOCABLE PROXY") to permit the Company to implement the voting agreement
    set forth in this Section 2. The Shareholder shall, upon request, execute
    and deliver any additional documents deemed by Company to be necessary
<PAGE>
    or desirable to complete and effectuate the Irrevocable Proxy and the
    provisions of this Agreement.

        3.  NO DISSENTERS RIGHTS.  The Shareholder agrees not to exercise any
    rights (including without limitation any rights that may exist under the
    Pennsylvania Business Corporation Law of 1988, as amended) to demand
    appraisal or dissenter's rights of any Subject Securities owned by the
    Shareholder with respect to the Merger or the other transactions
    contemplated by the Merger Agreement.

        4.  REPRESENTATIONS AND WARRANTIES OF THE SHAREHOLDER.  Shareholder
    hereby represents and warrants to Company as follows:

           (a)  AUTHORITY.  This Agreement and the Irrevocable Proxy are valid
       and binding agreements of the Shareholder. If the Shareholder is married
       and the Class A Shares constitute community property under applicable
       laws, this Agreement and the Irrevocable Proxy have been duly authorized,
       executed and delivered by and constitute valid and binding agreements of,
       such Shareholder's spouse. If this Agreement is being executed in a
       representative or fiduciary capacity the person signing this Agreement
       has full power and authority to enter into and perform this Agreement and
       the Irrevocable Proxy.

           (b) Shareholder owns beneficially all of the Class A Shares and has
       good and marketable title thereto, free and clear of any claims, liens,
       encumbrances or security interests whatsoever (other than any created
       hereby or made to Sovereign Bank prior to the date hereof). Shareholder
       does not beneficially own, or have any existing right to acquire, any
       securities of the Company other than the Class A Shares.

           (c) Shareholder has the full and unrestricted legal power, authority
       and right to enter into, execute and deliver this Agreement and the
       Irrevocable Proxy without the consent or approval of any other person and
       has not entered into any voting agreement or granted any person any proxy
       (revocable or irrevocable) with respect to the Class A Shares (other than
       this Agreement and the Irrevocable Proxy).

        6.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  The Company hereby
    represents and warrants to Shareholder that the Company has all requisite
    corporate power and authority to enter into this Agreement and to consummate
    the transactions contemplated hereby and thereby, that this Agreement has
    been duly executed and delivered by the Company and this Agreement
    constitutes the valid and binding obligation of the Company.

        7.  TERMINATION.  This Agreement and the Irrevocable Proxy shall
    terminate upon the earlier to occur of (a) the effective time of the Merger
    or (b) the termination of the Merger Agreement; PROVIDED, HOWEVER, that the
    term applicable to the transfer of Subject Securities specified on
    Exhibit A hereto shall terminate as specified in Exhibit A.

        8.  NO BROKERS.  Except for Company's fairness opinion and related
    services fee payable to Janney Montgomery Scott, the Shareholder and the
    Company represent, as to themselves and their affiliates, that to the best
    of their knowledge no agent, broker, investment banker or other firm or
    person is or will be entitled to any broker's or finder's fees or any other
    commission or similar fee in connection with any of the transactions
    contemplated by this Agreement and respectively agree to indemnify and hold
    the others harmless from and against any and all claims, liabilities or
    obligations with respect to any such fees, commissions or expenses asserted
    by any person on the basis of any act or statement alleged to have occurred
    or been made by such party or any of its affiliates.

        9.  ASSIGNMENT.  Neither this Agreement nor any of the rights, interests
    or obligations hereunder shall be assigned by either of the parties without
    the prior written consent of the other

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<PAGE>
    party. This Agreement will be binding upon, inure to the benefit of and be
    enforceable by the parties and their respective successors and assigns.

        10.  GENERAL PROVISIONS.

           (a)  SPECIFIC PERFORMANCE.  The parties hereto agree that if for any
       reason any party hereto shall have failed to perform its obligations
       under this Agreement or the Irrevocable Proxy, then the party seeking to
       enforce this Agreement or the Irrevocable Proxy shall be entitled to
       specific performance and injunctive and other equitable relief, and the
       parties hereto further agree to waive any requirement for the securing or
       posting of any bond in connection with the obtaining of any such
       injunctive or other equitable relief. This provision is without prejudice
       to any other rights or remedies, whether at law or in equity, that any
       party hereto may have against any other party hereto for any failure to
       perform its obligations under this Agreement or the Irrevocable Proxy.

           (b)  EXPENSES.  All costs and expenses incurred in connection with
       this Agreement and the transactions contemplated hereby shall be paid by
       the party incurring such costs and expenses.

           (c)  AMENDMENTS.  This Agreement may not be amended except by an
       instrument in writing signed by each of the parties hereto.

           (d)  NOTICES.  All notices, requests, claims, demands and other
       communications hereunder shall be deemed to have been duly given when
       delivered in person, by facsimile, telegram or telex, or by registered or
       certified mail (postage prepaid, return receipt requested), if to the
       Company, to its address as set forth on the signature page hereof and, if
       to Shareholder, to the address set forth on the signature page hereof.

           (e)  DESCRIPTIVE HEADINGS; DEFINITIONS.  The headings contained in
       this Agreement are for reference purposes only and shall not affect in
       any way the meaning or interpretation of this Agreement. All capitalized
       terms used herein but not defined herein shall have the meaning ascribed
       to them in the Merger Agreement.

           (f)  COUNTERPARTS.  This Agreement may be executed in two or more
       counterparts, all of which shall be considered one and the same
       agreement, and shall become effective when one or more of the
       counterparts have been signed by each of the parties and delivered to the
       other parties, it being understood that all parties need not sign the
       same counterpart.

           (g)  ENTIRE AGREEMENT.  This Agreement (including the exhibits
       hereto) constitutes the entire agreement and supersedes all prior
       agreements and understandings, both written and oral, among the parties
       with respect to the subject matter hereof. This Agreement (including the
       documents and instruments referred to herein) is not intended to and
       shall not be deemed to confer upon any person other than the parties
       hereto any rights or remedies hereunder. If any provision of this
       Agreement or the Irrevocable Proxy shall be invalid or unenforceable
       under applicable law, such provision shall be ineffective to the extent
       of such invalidity or unenforceability only, without in any way affecting
       the remaining provisions of this Agreement or the Irrevocable Proxy.

           (h)  GOVERNING LAW.  This Agreement shall be governed by and
       construed in accordance with the laws of the Commonwealth of
       Pennsylvania, applicable to contracts made and to be performed in that
       Commonwealth.

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<PAGE>
    IN WITNESS WHEREOF, the Company has caused this Agreement to be signed by
its respective officer thereunto duly authorized, and Shareholder has signed
this Agreement, all as of the date first written above.

<TABLE>
<S>                                                    <C>  <C>
                                                       INFONAUTICS, INC.

                                                       By:  /S/ GERARD J. LEWIS, JR.
                                                            -----------------------------------------
                                                            Title: VP & General Counsel, Secretary
                                                            Address: 590 North Gulph Road
                                                                    King of Prussia, PA 19406-2800 USA
                                                                    610-971-8859 (fax)

                                                       TUCOWS INC.

                                                       By:  /S/ ELLIOT NOSS
                                                            -----------------------------------------
                                                            Title: President and Chief Executive
                                                                 Officer
                                                            Address: 96 Mowat Avenue
                                                                    Toronto, Ontario M6K 3M1 Canada
                                                                    416-531-5584 (fax)

                                                       SHAREHOLDER:

/s/ GARY L. BRAGG
-------------------------------------------
                                                       /S/ MARVIN I. WEINBERGER
                                                       ---------------------------------------------
Witness
                                                       Name: Marvin I. Weinberger

/s/ GARY L. BRAGG
-------------------------------------------
                                                       /S/ FRAN SOLOW WEINBERGER
                                                       ---------------------------------------------
Witness
                                                       Name: Fran Solow Weinberger

                                                       Address: 630 Penfield Avenue
                                                               Havertown, PA 19083-4120
</TABLE>

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<PAGE>
                                                                       EXHIBIT A

                        TRANSFERS OF SUBJECT SECURITIES

    The Company agrees that the restrictions on transfer or acquisition of
Subject Securities set forth in Section 1 of this Agreement shall not apply with
respect to the following:

        1. The sale of that number of shares of Class A Common Stock of the
    Company equal to fifty percent (50%) of the number of shares of Class A
    Common Stock of the Company eligible to be sold by the Shareholder pursuant
    to Rule 144 under the Securities Act of 1933 during the period commencing
    two business days following the public announcement by the Company (the
    "Release Date") of the execution of the Merger Agreement and terminating
    three months following the Release Date.

        2. The sale of that number of shares of Class A Common Stock of the
    Company equal to seventy five percent (75%) of the number of shares of
    Class A Common Stock of the Company eligible to be sold by the Shareholder
    pursuant to Rule 144 under the Securities Act of 1933 during the period
    commencing three months following the Release Date and terminating six
    months following the Release Date.

    The Shareholder agrees that any sale of shares of Class A Common Stock
pursuant to Paragraphs 1 and 2 above shall be in compliance with Rule 144 and
the Company's policy regarding insider trading. The Company agrees to use its
best efforts to have all necessary clearances in order for the Shareholder to
sell his shares of Class A Common Stock under Rule 144 made as soon as
reasonably practicable after receipt by the Company, attention Vice President &
General Counsel, Gerard J. Lewis, Jr., of duly executed and completed paperwork
as may be required in order to complete such sale.

    In addition, the Company agrees to use its best efforts to file a
registration statement on Form S-3 with the Securities and Exchange Commission
as soon as reasonably practicable upon Shareholder's written request after
(a) consummation of the Merger or (b) any earlier termination of the Merger in
accordance with Paragraph 7(b). Such registration statement shall provide for
the registration of all shares of the Company owned by the Shareholder as a
result of the Merger less any shares previously sold by the Shareholder ("Merger
Shares"). If the Merger is terminated in accordance with Paragraph 7(b), such
registration statement shall provide for the registration of all shares of
Company owned by the Shareholder at the time of registration, less any shares
previously sold by the Shareholder ("Company Shares"). The registration rights
granted under this paragraph shall terminate when the Shareholder is eligible to
sell all of the Merger Shares or Company Shares, as the case may be, pursuant to
Rule 144(k).

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<PAGE>
                                                                       EXHIBIT B

                               IRREVOCABLE PROXY
                            EXECUTED MARCH 27, 2001

    Marvin I. Weinberger ("SHAREHOLDER"), being a holder of shares of Class A
Common Stock of Infonautics, Inc. (the "COMPANY") (the "CLASS A SHARES"), does
hereby constitute and appoint such person or persons as the Company shall
designate from time to time (the "Proxy") the true and lawful attorney and proxy
of Shareholder for him and in his name, place and stead, with full power of
substitution, for a term (the "TERM") of one year from the date of execution
hereof, to attend and to vote as the proxy of Shareholder, at any and all
meetings of shareholders of the Company or any adjournments thereof, all of the
Class A Shares eligible to vote which are held of record or beneficially, by
Shareholder, on any and all matters, proposals and questions, whether benefiting
the Proxy or Company or not, that may be lawfully considered there, and to
execute any written consents of Shareholder which may be solicited during the
Term, as fully and with the same number of votes and with the same effect as
Shareholder could do if personally present thereat or if personally solicited to
execute such written consents.

    Shareholder hereby revokes all proxies heretofore made by him.

    Shareholder hereby ratifies all that the Proxy may or shall lawfully do in
voting the Class A Shares in accordance herewith at any such meeting or
adjournment in respect of all matters, proposals and questions that may properly
come before the shareholders for consideration and action.

    Shareholder acknowledges that this proxy is coupled with an interest and is
irrevocable.

<TABLE>
<S>                                                    <C>  <C>
                                                       /S/ MARVIN I. WEINBERGER
                                                       ---------------------------------------------
                                                       Marvin I. Weinberger

                                                       /S/ FRAN SOLOW WEINBERGER
                                                       ---------------------------------------------
                                                       Fran Solow Weinberger
</TABLE>

                                       6<PAGE>
                                                                   EXHIBIT 10.20

                       TUCOWS INC. STOCKHOLDER AGREEMENT

    THIS STOCKHOLDER AGREEMENT ("Agreement"), dated as of March 27, 2001, is by
and between Infonautics, Inc., a Pennsylvania corporation ("Parent"),
Tucows Inc., a Delaware corporation (the "Company") and the stockholder of the
Company listed on the signature page hereof (the "Stockholder").

                                  WITNESSETH:

    WHEREAS, the Stockholder, as of the date hereof, is the beneficial owner (as
defined in Rule 13d-3(a) under the Securities Exchange Act of 1934, as amended)
of the number and class of shares of capital stock ("Stock") of the Company set
forth below the name of the Stockholder on the signature page hereof (the
"Shares");

    WHEREAS, in reliance upon the execution and delivery of this Agreement,
Parent and a wholly owned subsidiary of Parent ("Sub") will enter into an
Agreement and Plan of Merger, dated as of the date hereof (the "Merger
Agreement"), with the Company which provides, among other things, that upon the
terms and subject to the conditions thereof, Sub will be merged with and into
the Company, and the Company will become a wholly owned subsidiary of Parent
(the "Merger"); and

    WHEREAS, to induce Parent to enter into the Merger Agreement and to incur
the obligations set forth therein, the Stockholder is entering into this
Agreement pursuant to which the Stockholder agrees to vote in favor of the
Merger and the approval of the Merger Agreement and, in the case of holders of
the Company's Series A Convertible Preferred Stock, par value $.001 per share
(the "Preferred Shares"), to convert the Preferred Shares into shares of the
Company's common stock, par value $.001 per share ("Common Stock"), and to make
certain agreements with respect to the Shares upon the terms and conditions set
forth herein;

    NOW THEREFORE, in consideration of the foregoing and of the mutual covenants
and agreements set forth herein and for other good and valuable consideration,
the receipt and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

        Section 1.  VOTING OF SHARES.  The Stockholder agrees that until the
    earlier of (i) the Effective Time (as defined in the Merger Agreement) or
    (ii) the date on which the Merger Agreement is terminated pursuant to its
    terms (the earliest thereof being hereinafter referred to as the "Expiration
    Date"), at every meeting of stockholders of the Company at which any of the
    following matters is considered or voted upon, and at every adjournment or
    postponement thereof, and on every action or approval by written consent of
    the stockholders of the Company with respect thereto, the Stockholder shall
    vote, or cause the holder of record to vote, all Shares beneficially owned
    by the Stockholder as of the date of such vote or consent, and which are
    entitled to vote as of the date of such vote or consent, (i) for adoption
    and approval of the Merger Agreement and in favor of the Merger and any
    other transaction contemplated by the Merger Agreement and (ii) against any
    Acquisition Proposal (as defined below) other than the Merger. Any such vote
    shall be cast or consent shall be given in accordance with such procedures
    relating thereto as shall ensure that it is duly counted for purposes of
    determining that a quorum is present and for purposes of recording the
    results of such vote or consent.

        Section 2.  COVENANTS OF THE STOCKHOLDER.  The Stockholder covenants and
    agrees for the benefit of Parent that, until the Expiration Date, such
    Stockholder will:

           (a) not, directly or indirectly, sell, transfer, pledge, hypothecate,
       encumber, assign, tender or otherwise dispose of, or enter into any
       contract, option or other arrangement or understanding with respect to
       the sale, transfer, pledge, hypothecation, encumbrance,

                                       1
<PAGE>
       assignment, tender or other disposition of, any of the Shares
       beneficially owned by the Stockholder or any interest therein, provided
       that this restriction shall not apply to any sale, transfer, pledge,
       hypothecation, encumbrance, assignment, tender or disposition (or
       contract, option, arrangement or understanding with respect thereto) to
       any person who agrees to be bound by the terms of this Agreement;

           (b) not grant any powers of attorney or proxies or consents in
       respect of any of the Shares beneficially owned by the Stockholder,
       deposit any of such Shares into a voting trust, enter into a voting
       agreement with respect to any of such Shares or otherwise restrict the
       ability of the holder of any of the Shares beneficially owned by the
       Stockholder freely to exercise all voting rights with respect thereto;

           (c) not, and shall direct and cause the Stockholder's agents not to:

               (i) initiate, solicit or seek, directly or indirectly, any
           inquiries or the making or implementation of any proposal or offer
           (including, without limitation, any proposal or offer to the
           Company's stockholders or any of them) with respect to a merger,
           acquisition, consolidation, recapitalization, liquidation,
           dissolution or similar transaction involving, or any purchase of all
           or any substantial portion of the assets or any equity securities of,
           the Company (an "Acquisition Proposal");

               (ii) engage in any negotiations concerning an Acquisition
           Proposal, or provide any confidential information or data to, or have
           any substantive discussions with, any person relating to an
           Acquisition Proposal; or

               (iii) otherwise cooperate in any effort or attempt to make,
           implement or accept an Acquisition Proposal;

           (d) shall notify Parent immediately if any inquiries, proposals or
       offers related to an Acquisition Proposal are received by, any
       confidential information or data in connection with an Acquisition
       Proposal is requested from, or any negotiations or discussions related to
       an Acquisition Proposal are sought to be initiated or continued with, the
       Stockholder, and shall immediately cease and terminate any existing
       activities, including discussions or negotiations with any parties,
       conducted heretofore with respect to any of the foregoing and will take
       the necessary reasonable steps to inform his agents of the obligations
       undertaken in Section 2(c) above and this Section 2(d).

           (e) take, or cause to be taken, all action, and do, or cause to be
       done, all reasonable things necessary or advisable in order to consummate
       and make effective the transactions contemplated by this Agreement.

    Section 3.  REPRESENTATIONS AND WARRANTIES OF THE STOCKHOLDER.  The
Stockholder represents and warrants to Parent that: (a) the execution, delivery
and performance by the Stockholder of this Agreement will not conflict with,
require a consent, waiver or approval under, or result in a breach of or default
under, any of the terms of any contract, commitment or other obligation (written
or oral) to which the Stockholder is a party or by which any of the
Stockholder's assets may be bound, and, if the Stockholder is a corporation or
partnership, the organizational documents of such Stockholder; (b) this
Agreement has been duly executed and delivered by the Stockholder and, if the
Stockholder is a corporation or partnership, has been duly authorized by all
requisite corporate or partnership action of such Stockholder, as the case may
be, and upon its execution and delivery by Parent, will constitute a legal,
valid and binding obligation of the Stockholder, enforceable against the
Stockholder in accordance with its terms, except as enforceability may be
limited by bankruptcy, insolvency, reorganization, moratorium or other similar
laws affecting or relating to creditors' rights generally, and the availability
of injunctive relief and other equitable remedies; (c) the Stockholder is the
sole owner of the Shares, and the Shares represent all shares of the Stock
beneficially owned by the Stockholder at

                                       2
<PAGE>
the date hereof, and the Stockholder does not have any right to acquire, nor is
the Stockholder the beneficial owner of, any other shares of Stock or any
securities convertible into or exchangeable or exercisable for any shares of
Stock (other than shares subject to options granted by the Company or issuable
upon conversion of the Shares); (d) the Stockholder has full right, power and
authority to execute and deliver this Agreement and to perform the Stockholder's
obligations hereunder; and (e) the Stockholder owns the Shares free and clear of
all liens, claims, pledges, charges, proxies, restrictions, encumbrances,
proxies, voting trusts and voting agreements of any nature whatsoever other than
as provided by this Agreement. The representations and warranties contained
herein shall be made as of the date hereof and as of each day from the date
hereof through and including the Effective Time (as defined in the Merger
Agreement). If the Stockholder is an officer or director of the Company, the
Stockholder represents and acknowledges that the Stockholder is executing this
Agreement in such Stockholder's individual capacity, and not in his capacity as
an officer or director of the Company.

    Section 4.  ADJUSTMENTS; ADDITIONAL SHARES.  In the event (a) of any stock
dividend, stock split, merger (other than the Merger), recapitalization,
reclassification, combination, exchange of shares or the like of the capital
stock of the Company on, of or affecting the Shares or (b) that the Stockholder
shall become the beneficial owner of any additional shares of Stock or other
securities entitling the holder thereof to vote or give consent with respect to
the matters set forth in Section 1 (including, without limitation, shares of
Stock acquired upon the exercise of options), then the terms of this Agreement
shall apply to the shares of capital stock or other instruments or documents
held by the Stockholder immediately following the effectiveness of the events
described in clause (a) or the Stockholder becoming the beneficial owner thereof
as described in clause (b), as though, in either case, they were Shares
hereunder.

    Section 5.  CONVERSION OF PREFERRED SHARES.  Pursuant to Article 4(B)(5) of
the Certificate of Incorporation of the Company, as amended, the Stockholder
agrees prior to or at the Effective Time to convert all of the Preferred Shares
to shares of the Company's Common Stock.

    Section 6.  LEGEND.  Concurrently with the execution of this Agreement, the
Stockholder is surrendering to the Company the certificates representing the
Shares, and is hereby requesting that the following legend be placed on the
certificates representing such Shares and shall request that such legend remain
thereon until the Expiration Date: "The shares of capital stock represented by
this certificate are subject to a Stockholder Agreement, dated as of March   ,
2001, among the holder of this Certificate, Infonautics, Inc. and Tucows Inc.
which agreement, among other things, restricts the sale or transfer of such
shares except in accordance therewith." In the event that the Stockholder shall
become the beneficial owner of any additional shares of Stock or other
securities entitling the holder thereof to vote or give consent with respect to
the matters set forth in Section 1, the Stockholder shall, upon acquiring such
beneficial ownership, surrender to the Company the certificates representing
such shares or securities and request that the foregoing legend be placed on
such certificates and remain thereon until the Expiration Date. The Stockholder
shall provide Parent with satisfactory evidence of his compliance with this
Section 6 on or prior to the date ten business days after the execution hereof.

    Section 7.  SPECIFIC PERFORMANCE.  The Stockholder acknowledges that the
agreements contained in this Agreement are an integral part of the transactions
contemplated by the Merger Agreement, and that, without these agreements, Parent
would not enter into the Merger Agreement, and acknowledges that damages would
be an inadequate remedy for any breach by the Stockholder of the provisions of
this Agreement. Accordingly, the Stockholder, Parent and the Company each agree
that the obligations of the parties hereunder shall be specifically enforceable
and neither party shall take any action to impede the other from seeking to
enforce such right of specific performance.

    Section 8.  NOTICES.  All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be deemed duly given
(i) upon receipt, if delivered by hand, (ii) one day

                                       3
<PAGE>
after deposit, if deposited with a nationally recognized courier service that
guarantees next day delivery, or (iii) three business days after mailing, if
mailed by registered or certified mail, postage prepaid, return receipt
requested, to the Stockholder at the address listed on the signature page
hereof, to Parent at 590 North Gulph Road, King of Prussia, PA 19406, Attention:
President and CEO, with a copy to Joanne R. Soslow, Esquire, Morgan, Lewis &
Bockius LLP, 1701 Market Street, Philadelphia, PA 19102, and to the Company at
96 Mowat Avenue, Toronto, Ontario M6K 3M1, Canada, Attn: Elliot Noss and Graham
Morris, with a copy to David Fox, Esquire, Skadden, Arps, Slate, Meagher & Flom
LLP, 4 Times Square, New York, NY 10036, or to such other address as any party
may have furnished to the other in writing in accordance herewith.

    Section 9.  BINDING EFFECT; SURVIVAL.  This Agreement shall become effective
as of the date hereof and shall remain in effect until the Expiration Date. This
Agreement shall inure to the benefit of and be binding upon the parties hereto
and their respective heirs, personal representatives, successors and assigns.
Neither this Agreement nor any of the rights, interests or obligations of the
parties hereto may be assigned without the prior written consent of the other
party.

    Section 10.  GOVERNING LAW; CONSENT TO JURISDICTION AND SERVICE OF
PROCESS.  This Agreement shall be governed by and construed in accordance with
the laws of the State of Delaware without giving effect to any principles of
conflicts of law that would compel the application of the substantive laws of a
jurisdiction other than Delaware. Each of the parties hereto hereby consents to
the jurisdiction of any state or federal court located within the state of
Delaware and irrevocably agrees that all actions or proceedings relating to this
Agreement may be litigated in such courts. The parties hereto accept the
nonexclusive jurisdiction of the aforesaid courts and waive any defense of forum
non convenient, and irrevocably agree to be bound by any judgment rendered
thereby (subject to any appeal available with respect to such judgment) in
connection with this Agreement. The Stockholder hereby irrevocably appoints
Company to serve as his, her or its agent, to receive on his, her or its behalf
service of all process in any such proceeding in any such court, such service
being hereby acknowledged by the Stockholder to be effective and binding service
in every respect. The Stockholder hereby agrees that service upon the
Stockholder by mail shall constitute sufficient notice and service of process.
Nothing herein shall affect the right to serve process in any other manner
permitted by law or shall limit the right of Parent to bring proceedings or
obtain or enforce judgments against the Stockholder in the courts of any other
jurisdiction.

    Section 11.  COUNTERPARTS.  This Agreement may be executed in multiple
counterparts, each of which shall be an original and all of which together shall
constitute one and the same agreement.

    Section 12.  EFFECT OF HEADINGS.  The section headings herein are for
convenience of reference only and shall not affect the construction hereof.

    Section 13.  ADDITIONAL AGREEMENTS; FURTHER ASSURANCE.  Subject to the terms
and conditions herein provided, the Stockholder agrees to use all reasonable
efforts to take, or cause to be taken, all action and to do, or cause to be
done, all things necessary, proper or advisable to consummate and make effective
the transactions contemplated by this Agreement. The Stockholder will provide
Parent with all documents which may reasonably be requested by Parent and will
take reasonable steps to enable Parent to obtain all rights and benefits
provided it hereunder. The Stockholder hereby gives any consents or waivers that
are reasonably required for the consummation of the Merger under the terms of
any agreement to which the Stockholder is party or pursuant to any rights the
Stockholder may have.

    Section 14.  AMENDMENT; WAIVER.  No amendment or waiver of any provision of
this Agreement or consent to departure therefrom shall be effective unless in
writing and signed by Parent, the Stockholder and the Company, in the case of an
amendment, or by the party which is the beneficiary of any such provision, in
the case of a waiver or a consent to depart therefrom.

                                       4
<PAGE>
    Section 15.  SEVERABILITY.  If any term provision, covenant or restriction
of this Agreement is held by a court of competent jurisdiction to be invalid,
void or unenforceable, then the remainder of the terms, provisions, covenants
and restrictions of this Agreement shall remain in full force and effect and
shall in no way be affected, impaired or invalidated.

    Section 16.  EFFECTIVENESS.  This Agreement shall not become effective
unless Marvin I. Weinberger and Ms. Fran Solow Weinberger (the "Weinbergers")
shall have entered into a shareholders agreement among the Weinbergers, Parent
and the Company containing substantially the same terms and conditions as
contained herein.

    Section 17.  ENFORCEMENT.  The Company will upon demand pay to Parent the
amount of any and all reasonable expenses of Parent, including the reasonable
fees and disbursements of its counsel, which Parent may incur in connection the
enforcement of this Agreement by Parent.

    Section 18.  TIME.  Time is of the essence with respect to this Agreement.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                       5
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:  /s/ GERARD J. LEWIS, JR.
                                                               ---------------------------------------
                                                               Name: Gerard J. Lewis, Jr.
                                                               Title: Vice President and General
                                                               Counsel
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By: /s/ ELLIOT NOSS
---------------------------------------------
Name: Elliot Noss
Title: President and Chief Executive Officer

STOCKHOLDER
/s/ ELLIOT NOSS
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Elliot Noss
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: Common Shares -- 90,601

                          Series A Convertible Pref. Shares -- 100,379

                                       6
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ SCOTT SWEDORSKI
---------------------------------------------
(Signature)

/s/ VICTORIA SWEDORSKI
---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Scott A. Swedorski
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 100,201 Common Shares

                          45,083 Series A Conv. Pref Shares

                                       7
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ GRAHAM MORRIS
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Graham B. Morris
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 26,357 Series A Convertible Preferred Shares

                                       8
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ MICHAEL COOPERMAN
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
M. Cooperman
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: Series A Conv Pref. Shares -- 63,415

                                       9
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ PETER VEENENDAAL
---------------------------------------------
(Signature for and on behalf of Redel Inc.)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Redel Inc.
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 285,707 Series A Shares

                                       10
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ PETER BLAUW
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
STI Ventures N.V.
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 12,265,527 Preferred Shares

                                       11
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ PETER VEENENDAAL
---------------------------------------------
(Signature for and on behalf of
Parman Holding Corp.)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Parman Holding Corp.
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 6,672,280 Series A Shares

                                       12
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:  ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ DAVID KEATING
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
David Keating
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 8,807 Series A Conv. Pref. Shares

                                       13
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ ANTHONY BARNHART
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Anthony Barnhart
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 266 Series A Conv. Pref. Shares

                                       14
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ LILLIAN CAMPBELL
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Lillian Campbell
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 8,828 Series A Conv. Pref. Shares -- 196,639 Common
Shares

                                       15
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ REBECCA SOBOL
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Rebecca Sobol
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 4,747 Common Shares

                                       16
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ ELIZABETH COOLBAUGH
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Elizabeth Coolbaugh
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 199,367 Series A Conv. Pref. Shares

                                       17
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ GALEN FORREST COOK
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Galen Forrest Cook
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 23,734 Series A Conv. Pref. Shares

                                       18
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ JONATHAN CORBET
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Jonathan Corbet
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 199,367 Series A Conv. Pref. Shares

                                       19
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ DENNIS TENNEY
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Dennis Tenney
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 47,468 Series A Conv. Pref. Shares

                                       20
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ COLIN CAMPBELL
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Colin Campbell
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 35,192 Series A Conv. Pref. Shares, 783,857 Common
Shares

                                       21
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ JOHN NEMANIC
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
John Nemanic
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 41,049 Series A Conv. Pref. Shares, 914,351 Common
Shares

                                       22
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ WILLIAM CAMPBELL
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
William Campbell
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 41,049 Series A Conv. Pref. Shares, 914,351 Common
Shares

                                       23
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been duly executed by the parties
hereto all as of the day and year first above written.

<TABLE>
<S>                                                       <C>  <C>
                                                          INFONAUTICS, INC.

                                                          By:
                                                               ---------------------------------------
                                                               Name:
                                                               Title:
</TABLE>

<TABLE>
<CAPTION>
TUCOWS INC.
<S>                                                       <C>
By:
---------------------------------------------
Name:
Title:

STOCKHOLDER
/s/ CHARMAINE D'SILVA
---------------------------------------------
(Signature)

---------------------------------------------
(Signature of Spouse)

Print Name of Stockholder
Charmaine D'Silva
---------------------------------------------

Address:
---------------------------------------------
---------------------------------------------
---------------------------------------------
</TABLE>

Number and Class of Shares: 2,000 Series A Pref. Shares

                                       24

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