Document:

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                                                        Exhibit 4.12

                          JUPITER MEDIA METRIX, INC.
                            STOCK OPTION AGREEMENT

            AGREEMENT made as of the 27th day of December, 2000, by and between
Jupiter Media Metrix, Inc., a Delaware corporation (the "COMPANY"), and IPSOS
S.A, a French corporation (the "OPTIONEE").

                             W I T N E S S E T H
                             -------------------

            WHEREAS, the Company and the Optionee (together the
"SHAREHOLDERS") are shareholders of JMXI Latin America B.V. ("JMXI LATIN
AMERICA B.V."); and

            WHEREAS, the Company desires to grant to the Optionee, and the
Optionee desires to accept, an option (the "OPTION") to acquire shares of common
stock, $.01 par value, of the Company (the "COMMON STOCK") upon the terms and
conditions set forth in this agreement.

            NOW, THEREFORE, the parties hereto agree as follows:

            1. GRANT.

            (a) Subject to the terms and conditions set forth in this Stock
Option Agreement, the Company hereby grants to the Optionee an Option to
exchange all, but not less than all shares of JMXI Latin America B.V. (the
"SHARES") for shares of Common Stock at any time during a five (5) year period
commencing at 9:00 am (New York time) on December 22, 2000 and ending at 5:00 pm
(New York time) December 21, 2005 (the "EXCHANGE PERIOD"). The number of shares
of Common Stock Optionee shall receive shall be determined by dividing the
aggregate U.S. dollar amount of Optionee's investment (determined based on the
Euro-U.S. dollar exchange rate quoted in the Wall Street Journal on the date
hereof) in JMXI Latin America B.V. by US$10.00 (the "PER SHARE OPTION PRICE").

            (b) The Option may be exercised by the Optionee if the net annual
revenues of JMXI Latin America B.V. exceed 60% of the budgeted net annual
revenues set forth in the budget approved by the board of JMXI Latin American
B.V. for the period ending December 31 of the prior year.

            2. EXERCISES; REPRESENTATIONS AND WARRANTIES.

            (a) The Option may be exercised in whole but not in part in
accordance with Section 1 hereof by delivering to the Secretary of the Company
(a) a written notice specifying the number of shares to be acquired, and (b)
delivery of certificates representing the Shares. It shall be a condition to the
issuance of the Common Stock certificates that an amount, if any, deemed
necessary by the Company to enable it to satisfy any income tax withholding
obligations with respect to the exercise shall be remitted to the Company
(unless other arrangements acceptable to the Company are made for the
satisfaction of such withholding obligations).

            (b) The Company hereby represents and warrants the following to the
Optionee:
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                  (i) The Company has the full right, power and authority to
      enter into this Agreement and to allot and set aside such number of shares
      of Common Stock as is necessary upon the exercise of the Option.

                  (ii) This Agreement has been duly authorized, executed and
      delivered and constitutes the legal, valid and binding obligations of the
      Company, enforceable in accordance with its terms, except as enforcement
      may be limited by bankruptcy, insolvency, moratorium or other laws
      affecting creditors' rights generally, or equity principles, whether in a
      proceeding in equity or law.

                  (iii) The Company has not, to its knowledge, taken any action
      which would cause it to violate the Securities Act of 1933, as amended, or
      the Securities Exchange Act of 1934, as amended.

                  (iv) The Common Stock subject to the exercise of the Option
      will be, at the time of the exercise of the Option, listed on NASDAQ.

                  (v) The execution and delivery of this Agreement by the
      Company will not result in a violation of, be in conflict with, or
      constitute a default under, with or without the passage of time or the
      giving notice: (i) any provision of the certificate of incorporation or
      by-laws of the Company, (ii) any material contract or other arrangement to
      which the Company is bound or (iii) any statute, rule or governmental
      regulation applicable to the Company. The execution and delivery of this
      Agreement by the Company will not impair the Company's ability to issue
      Common Stock.

                  (vi)  The Company has obtained all necessary consents or
      approvals necessary for execution, delivery and performance of this
      Agreement.

            3. RESERVATION OF SHARES; LISTING. The Company agrees that, prior to
the expiration of this Option, the Company will at all times have authorized and
in reserve, and will keep available, solely for issuance or delivery upon the
exercise of this Option, the shares of the Common Stock and other securities and
properties as from time to time shall be receivable upon the exercise of this
Option, free and clear of all restrictions on sale or transfer and free and
clear of all preemptive rights and rights of first refusal and keep the shares
of the Common Stock receivable upon the exercise of this Option authorized for
listing on NASDAQ upon notice of issuance.

            4. PROTECTION AGAINST DILUTION.

            (a) In case the Company shall hereafter (i) pay a dividend or make a
distribution on its capital stock in shares of Common Stock, (ii) subdivide its
outstanding shares of Common Stock into a greater number of shares, (iii)
combine its outstanding shares of Common Stock into a smaller number of shares
or (iv) issue by reclassification of its Common Stock any shares of capital
stock of the Company, the Per Share Option Price shall be adjusted so that the
Optionee upon the exercise hereof shall be entitled to receive the number of
shares of Common Stock or other capital stock of the Company which it would have
owned immediately following such action had such Option been exercised
immediately prior thereto. An adjustment made pursuant to this Subsection 4(a)
shall become effective immediately after the record date in

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the case of a dividend or distribution and shall become effective immediately
after the effective date in the case of a subdivision, combination or
reclassification.

            (b) If, at any time or from time to time after the date of this
Option, the Company shall issue or distribute to the holders of shares of Common
Stock evidences of its indebtedness, any other securities of the Company or any
cash, property or other assets (excluding a subdivision, combination or
reclassification, or dividend, and also excluding cash dividends or cash
distributions paid out of net profits legally available therefor if the full
amount thereof, together with the value of other dividends and distributions
made substantially concurrently therewith or pursuant to a plan which includes
payment thereof, is equivalent to not more than 5% of the Company's net worth)
(any such nonexcluded event being herein called a "SPECIAL DIVIDEND"), the Per
Share Option Price shall be adjusted by multiplying the Per Share Option Price
then in effect by a fraction, the numerator of which shall be the then current
market price of the Common Stock (defined as the average for the five
consecutive business days immediately prior to the record date of the daily
closing price of the Common Stock as reported by the national securities
exchange upon which the Common Stock is then listed or if not listed on any such
exchange, the average of the closing prices as reported by NASDAQ) less the fair
market value (as determined by the Company's Board of Directors) of the
evidences of indebtedness, cash, securities or property, or other assets issued
or distributed in such Special Dividend applicable to one share of Common Stock
and the denominator of which shall be such then current market price per share
of Common Stock. An adjustment made pursuant to this Subsection 4(b) shall
become effective immediately after the record date of any such Special Dividend.

            (c) In case of any capital reorganization or reclassification, or
any consolidation or merger to which the Company is a party other than a merger
or consolidation in which the Company is the continuing corporation, or in case
of any sale or conveyance to another entity of the property of the Company as an
entirety or substantially as an entirety, or in the case of any statutory
exchange of securities with another corporation (including any exchange effected
in connection with a merger of a third corporation into the Company), the
Optionee shall have the right thereafter to receive on the exercise of this
Option the kind and amount of securities, cash or other property which the
holder would have owned or have been entitled to receive immediately after such
reorganization, reclassification, consolidation, merger, statutory exchange,
sale or conveyance had this Option been exercised immediately prior to the
effective date of such reorganization, reclassification, consolidation, merger,
statutory exchange, sale or conveyance and in any such case, if necessary,
appropriate adjustment shall be made in the application of the provisions set
forth in this Section 4 with respect to the rights and interests thereafter of
the Optionee to the end that the provisions set forth in this Section 4 shall
thereafter correspondingly be made applicable, as nearly as may reasonably be,
in relation to any shares of stock or other securities or property thereafter
deliverable on the exercise of this Option. The above provisions of this
Subsection 4(c) shall similarly apply to successive reorganizations,
reclassifications, consolidations, mergers, statutory exchanges, sales or
conveyances. The issuer of any shares of stock or other securities or property
thereafter deliverable on the exercise of this Option shall be responsible for
all of the agreements and obligations of the Company hereunder. Notice of any
such reorganization, reclassification, consolidation, merger, statutory
exchange, sale or conveyance and of said provisions so proposed to be made,
shall be mailed to the holders of the Options not less than 30 days prior to
such event. A sale of all or substantially all of the

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assets of the Company for a consideration consisting primarily of securities
shall be deemed a consolidation or merger for the foregoing purposes.

            (d) No adjustment in the Per Share Option Price shall be required
unless such adjustment would require an increase or decrease of at least $0.05
per share of Common Stock; provided, however, that any adjustments which by
reason of this Subsection 4(d) are not required to be made shall be carried
forward and taken into account in any subsequent adjustment. All calculations
under this Section 4 shall be made to the nearest cent or to the nearest 1/l00th
of a share, as the case may be. Anything in this Section 4 to the contrary
notwithstanding, the Company shall be entitled to make such reductions in the
Per Share Option Price, in addition to those required by this Section 4, as it
in its discretion shall deem to be advisable in order that any stock dividend,
subdivision of shares or distribution of rights to purchase stock or securities
convertible or exchangeable for stock hereafter made by the Company to its
stockholders shall not be taxable.

            (e) If the Board of Directors of the Company shall (i) declare any
dividend or other distribution with respect to the Common Stock, other than a
cash dividend subject to the first parenthetical in Subsection 4(b), (ii) offer
to the holders of shares of Common Stock any additional shares of Common Stock,
any securities convertible into or exercisable for shares of Common Stock or any
rights to subscribe thereto, or (iii) propose a dissolution, liquidation or
winding up of the Company, the Company shall mail notice thereof to the Optionee
not less than 15 days prior to the record date fixed for determining
stockholders entitled to participate in such dividend, distribution, offer or
subscription right or to vote on such dissolution, liquidation or winding up.

            (f) If, as a result of an adjustment made pursuant to this Section
4, the holder of any Option thereafter surrendered for exercise shall become
entitled to receive shares of two or more classes of capital stock or shares of
Common Stock and other capital stock of the Company, the Board of Directors
(whose determination shall be conclusive and shall be described in a written
notice to the holder of any Option promptly after such adjustment) shall
determine the allocation of the adjusted Per Share Option Price between or among
shares or such classes of capital stock or shares of Common Stock and other
capital stock.

            (g) Upon each adjustment of the Per Share Option Price pursuant to
the provisions of this Section 4, the number of shares of Common Stock issuable
upon the exercise at the adjusted Per Share Option Price of the Option shall be
adjusted to the nearest full amount by multiplying a number equal to the Per
Share Option Price in effect immediately prior to such adjustment by the number
of shares of Common Stock issuable upon exercise of the Option immediately prior
to such adjustment and dividing the product so obtained by the adjusted Per
Share Option Price.

            5. RIGHTS AS STOCKHOLDER. Upon the exercise of the Option in
accordance with the terms hereof, the Company shall cause the number of shares
of Common Stock issuable to be issued to the Optionee as fully paid and
non-assessable shares of Common Stock and shall cause the share certificates
representing such shares to be delivered to the Optionee as soon as possible
thereafter. No shares of Common Stock shall be sold or delivered hereunder until
full payment for such shares has been made. The Optionee shall have no rights as
a stockholder with

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respect to any share covered by the Option until stock certificate for such
shares is issued to the Optionee. Expect as otherwise provided herein, no
adjustment shall be made for dividends or distributions of other rights for
which the record date is prior to the date such stock certificate is issued.

            6. LIMITED TRANSFERABILITY. This Option may not be sold,
transferred, assigned or hypothecated by the Optionee except in compliance with
the provisions of the Securities Act of 1933, as amended. The Company may treat
the registered holder as he or it appears on the Company's books at any time as
the holder for all purposes. The Company shall permit any Optionee or his duly
authorized attorney, upon written request during ordinary business hours, to
inspect and copy or make extracts from its books showing the registered holders
of options. All options issued upon the transfer or assignment of this Option
will be dated the same date as this Option, and all rights of the holder thereof
shall be identical to those of the Optionee.

            7. ADMINISTRATION. The Board of Directors of the Company will have
full power and authority to interpret and apply the provisions of this agreement
on behalf of the Company and act on behalf of the Company in connection with
this agreement, and the decision of the Board of Directors of the Company as to
any matter arising under this agreement shall be binding and conclusive as to
the Company.

            8. MISCELLANEOUS.

            (a) This agreement shall be binding upon and shall inure to the
benefit of the parties hereto and their respective successors and permitted
assigns.

            (b) This agreement shall be governed by and construed in accordance
with the laws of the State of Delaware. Except as specified in the Shareholders'
Agreement by and between the parties hereto dated as of the date hereof, this
agreement constitutes the entire agreement between the parties with respect to
the subject matter hereof and may not be modified except by written instrument
executed by the parties.

            (c) The parties hereto agree that any dispute, disagreement or
controversy between any party relating to this Agreement that cannot be resolved
by the parties shall promptly be submitted to arbitration to be resolved by
final and binding arbitration in accordance with the provisions of the American
Arbitration Association. The place of arbitration shall be New York, New York.
The arbitration tribunal shall be composed of three arbitrators who have
sufficient experience in the matters at hand, one of whom shall be appointed by
the Company, one of whom shall be appointed by Optionee and one of whom shall be
appointed by such two arbitrators. The arbitrators will be directed to and shall
resolve such dispute, disagreement or controversy on the basis of the
information provided to them as soon as practicable. The arbitration award shall
be given in writing and shall be final, binding on the parties, not subject to
any appeal, and shall deal with questions of costs of arbitration and all
matters related thereto.

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            IN WITNESS WHEREOF, this agreement has been executed as of the date
first above written.

                                    JUPITER MEDIA METRIX, INC.

                                    By:  /s/ Tod Johnson
                                       -----------------------------------

                                    IPSOS S.A.

                                    By: /s/ Didier Truchot
                                       -----------------------------------

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                                                                Exhibit 10.22

                              EMPLOYMENT AGREEMENT

      This Employment Agreement (the "Agreement"), made and entered into this
19th day of September, 2000, by and between Jupiter Communications, Inc., a
Delaware corporation (the "Company"), and Gene DeRose (the "Executive").

                                   WITNESSETH

      WHEREAS, pursuant to an Agreement and Plan of Merger and Reorganization
dated June 26, 2000 (the "Merger Agreement"), a subsidiary of Media Metrix, Inc.
("Media Metrix") is to be merged with and into the Company (the "Merger");

      WHEREAS, the Executive is a significant shareholder in the Company, will
receive substantial consideration in connection with the Merger and desires the
Merger to occur;

      WHEREAS, the Executive's agreement to the terms and conditions contained
herein is a condition of Media Metrix' execution of the Merger Agreement;

      WHEREAS, the Executive has served as Chief Executive Officer of the
Company and the parties wish that he continue to serve as an officer of Media
Metrix following the closing of the Merger;

      WHEREAS, the Executive shall be employed by Media Metrix upon the
closing of the Merger; and

      WHEREAS, the Executive and the Company desire to enter into a formal
Employment Agreement to set forth the terms and conditions of the Executive's
employment with Media Metrix upon the closing of the Merger.

      NOW, THEREFORE, in consideration of the mutual promises, terms,
provisions, and conditions contained herein, the parties agree as follows:

      1.    Position.

            Upon the closing of the Merger, the Executive will assume the
position of President and Chief Operating Officer for Media Metrix reporting
directly to Media Metrix' Chief Executive Officer and performing duties
commensurate with such position. The Executive shall perform his duties
diligently and faithfully and shall devote his full business time and attention
to such duties, provided that the Executive may devote time and attention to
personal financial matters and charitable activities.

      2.    Term of Agreement and Renewal.

            This Agreement will become effective and the term of Executive's
employment under this Agreement will commence on the date of the closing of the
Merger (the "Effective Date"). Subject to the provisions of Section 8 of this
Agreement, the term of Executive's employment hereunder shall be for an initial
term of three (3) years from the Effective Date (the "Initial Term"). The
Initial Term of this Agreement shall be automatically extended for
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successive one (1) year periods (each a "Renewal Period") unless the Company or
the Executive gives written notice to the other at least ninety (90) days prior
to the expiration of the Initial Term, or a Renewal Period, of such party's
election not to extend this Agreement. References herein to the "Term" shall
mean the Initial Term as it may be so extended by one or more Renewal Periods.
The last day of the Term is the "Expiration Date."

      3.    Compensation and Benefits.

            (a) Salary. Commencing on the Effective Date, the Company agrees to
pay the Executive a base salary at an initial annual rate of Two Hundred Forty
Thousand Dollars ($240,000), payable in such installments as is the policy of
the Company (the "Salary"), but no less frequently than monthly. Thereafter, the
Board of Directors of Media Metrix (the "Board") shall determine appropriate
increases to Executive's Salary but in no event shall diminish the amount of
Executive's Salary below the initial annual rate, or below any increased rates
unless all of the Executive's peer executives undergo comparable decreases.

            (b) Bonus. The Executive shall receive a guaranteed annual bonus of
Twenty Five Percent (25%) of the annual Salary (pro rated for any partial
calendar years worked by the Executive during the Term), and shall be eligible
for an additional annual bonus amount of up to Fifteen Percent (15%) of the
Salary (pro rated for any partial calendar years worked by the Executive during
the Term) based on his achievement of reasonable performance goals to be agreed
upon by the Company and the Executive on or about the Effective Date and at the
commencement of each calendar year during the Term.

            (c) Benefits. The Executive shall be entitled to participate in all
employee benefit plans which the Company provides or may establish from time to
time for the benefit of its employees, including, without limitation, group
life, medical, surgical, dental and other health insurance, short and long-term
disability, deferred compensation, profit-sharing, paid vacation and similar
benefits.

            (d) Stock Options. As of the Effective Date, but immediately prior
to the Merger, the Company shall grant the Executive, pursuant to the Company's
Stock Option Plan, an option to purchase Forty Five Thousand (45,000) shares of
the Company's common stock at a purchase price equal to the fair market value of
the shares at the time of the grant, vesting as to 25% of the option shares on
the first anniversary of the grant, and in thirty six (36) equal monthly
installments thereafter, in each case as long as the Executive is employed by
the Company on such vesting date.

            (e) Expenses. The Company shall pay or reimburse the Executive for
all reasonable out-of-pocket expenses actually incurred by him during the Term
in performing services hereunder, provided that the Executive properly accounts
for such expenses in accordance with the Company's policies.

      4.    Confidentiality, Disclosure of Information.

            (a) The Executive recognizes and acknowledges that the Executive has
had and will have access to Confidential Information (as defined below) relating
to the business or interests of the Company or of persons with whom the Company
may have business

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relationships. The Executive will not during the Term, or at any time
thereafter, use, disclose or permit to be known by any other person or entity,
any Confidential Information of the Company (except as required by applicable
law or in connection with the performance of the Executive's duties and
responsibilities hereunder). The term "Confidential Information" means
information relating to the Company's business affairs, proprietary technology,
trade secrets, patented processes, research and development data, know-how,
market studies and forecasts, competitive analyses, pricing policies, employee
lists, employment agreements (other than this Agreement), personnel policies,
the substance of agreements with customers, suppliers and others, marketing
arrangements, customer lists, commercial arrangements, or any other information
relating to the Company's business that is not generally known to the public or
to actual or potential competitors of the Company (other than through a breach
of this Agreement). This obligation shall continue until such Confidential
Information becomes publicly available, other than pursuant to a breach of this
Agreement by the Executive, regardless of whether the Executive continues to be
employed by the Company.

            (b) It is further agreed and understood by and between the parties
to this Agreement that all "Company Materials," which include, but are not
limited to, computers, computer software, computer disks, tapes, printouts,
source, HTML and other code, flowcharts, schematics, designs, graphics,
drawings, photographs, charts, graphs, notebooks, customer lists, sound
recordings, other tangible or intangible manifestation of content, and all other
documents whether printed, typewritten, handwritten, electronic, or stored on
computer disks, tapes, hard drives, or any other tangible medium, as well as
samples, prototypes, models, products and the like, shall be the exclusive
property of the Company and, upon termination of Executive's employment with the
Company, and/or upon the request of the Company, all Company Materials,
including copies thereof, as well as all other Company property then in the
Executive's possession or control, shall be returned to and left with the
Company.

      5.    Inventions Discovered by Executive.

            The Executive shall promptly disclose to the Company any invention,
improvement, discovery, process, formula, or method or other intellectual
property, whether or not patentable or copyrightable (collectively,
"Inventions"), conceived or first reduced to practice by the Executive, either
alone or jointly with others, while performing services hereunder (or, if based
on any Confidential Information, at any time during or after the Term), (a)
which pertain to any line of business activity of the Company, whether then
conducted or then being actively planned by the Company, with which the
Executive was or is involved, (b) which is developed using time, material or
facilities of the Company, whether or not during working hours or on the Company
premises, or (c) which directly relates to any of the Executive's work during
the Term, whether or not during normal working hours. The Executive hereby
assigns to the Company all of the Executive's right, title and interest in and
to any such Inventions. During and after the Term, the Executive shall execute
any documents necessary to perfect the assignment of such Inventions to the
Company and to enable the Company to apply for, obtain and enforce patents,
trademarks and copyrights in any and all countries on such Inventions,
including, without limitation, the execution of any instruments and the giving
of evidence and testimony, without further compensation beyond the Executive's
agreed compensation during the course of the Executive's employment. Without
limiting the foregoing, the Executive further acknowledges that all original
works of authorship by the Executive, whether created alone or jointly with

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others, related to the Executive's employment with the Company and which are
protectable by copyright, are "works made for hire" within the meaning of the
United States Copyright Act, 17 U.S.C. Section 101, as amended, and the
copyright of which shall be owned solely, completely and exclusively by the
Company. If any Invention is considered to be work not included in the
categories of work covered by the United States Copyright Act, 17 U.S.C. Section
101, as amended, such work is hereby assigned or transferred completely and
exclusively to the Company. The Executive hereby irrevocably designates counsel
to the Company as the Executive's agent and attorney-in-fact to do all lawful
acts necessary to apply for and obtain patents and copyrights and to enforce the
Company's rights under this Section. This Section 5 shall survive the
termination of this Agreement. Any assignment of copyright hereunder includes
all rights of paternity, integrity, disclosure and withdrawal and any other
rights that may be known as or referred to as "moral rights" (collectively
"Moral Rights"). To the extent such Moral Rights cannot be assigned under
applicable law and to the extent the following is allowed by the laws in the
various countries where Moral Rights exist, the Executive hereby waives such
Moral Rights and consents to any action of the Company that would violate such
Moral Rights in the absence of such consent. The Executive agrees to confirm any
such waivers and consents from time to time as requested by the Company.

      6.    Non-Competition and Non-Solicitation.

            The Executive acknowledges that the Company has invested substantial
time, money and resources in the development and retention of its customers,
accounts, business partners, Inventions, and other Confidential Information
(including trade secrets), and further acknowledges that during the course of
the Executive's employment with the Company the Executive has had and will have
access to the Company's Inventions and Confidential Information (including trade
secrets), and will be introduced to existing and prospective customers, accounts
and business partners of the Company.

            In recognition of this, the Executive covenants and agrees that:

            (a) During the Term, and for a period of two (2) years thereafter,
the Executive may not, without the prior written consent of the Company,
(whether as an employee, agent, servant, owner, partner, consultant, independent
contractor, representative, stockholder or in any other capacity whatsoever)
participate in any business that offers products or services directly
competitive with those offered by the Company (a "Business"). Notwithstanding
the foregoing, the Executive shall be permitted to consult for or be employed by
an entity engaging in a Business during the two year post-employment
non-competition period if he works for a independently-managed and operated
subsidiary, affiliate or division of such entity that does not engage in a
Business and does not perform any services for the aspects of such entity
engaging in a Business. Nothing herein shall prevent the Executive from
acquiring or owning 3% or less of any publicly-traded class of securities so
long as the Executive holds such securities as a passive investment.

            (b) During the Term, and for a period of two (2) years thereafter,
the Executive may not entice, solicit or encourage any Company employee to leave
the employ of the Company or any independent contractor to sever its engagement
with the Company, absent prior written consent to do so from the Company.

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            (c) During the Term, and for a period of two (2) years thereafter,
the Executive may not, directly or indirectly, entice, solicit or encourage any
customer or prospective customer of the Company to cease doing business with the
Company, reduce its relationship with the Company or refrain from establishing
or expanding a relationship with the Company, absent prior written consent to do
so from the Company.

      7.    Provisions Necessary and Reasonable.

            (a) The Executive agrees that (i) the provisions of Sections 4, 5
and 6 of this Agreement are necessary and reasonable to protect the Company's
Confidential Information, Inventions, and goodwill; (ii) the specific temporal,
geographic and substantive provisions set forth in Section 6 of this Agreement
are reasonable and necessary to protect the Company's business interests; and
(iii) in the event of any breach of any of the covenants set forth herein, the
Company would suffer substantial irreparable harm and would not have an adequate
remedy at law for such breach. In recognition of the foregoing, the Executive
agrees that in the event of a breach or threatened breach of any of these
covenants, in addition to such other remedies as the Company may have at law,
without posting any bond or security, the Company shall be entitled to seek and
obtain equitable relief, in the form of specific performance, and/or temporary,
preliminary or permanent injunctive relief, or any other equitable remedy which
then may be available. The seeking of such injunction or order shall not affect
the Company's right to seek and obtain damages or other equitable relief on
account of any such actual or threatened breach.

            (b) If any of the covenants contained in Sections 4, 5 and 6 hereof,
or any part thereof, are hereafter construed to be invalid or unenforceable, the
same shall not affect the remainder of the covenant or covenants, which shall be
given full effect without regard to the invalid portions.

            (c) If any of the covenants contained in Sections 4, 5 and 6 hereof,
or any part thereof, are held to be unenforceable by a court of competent
jurisdiction because of the temporal or geographic scope of such provision or
the area covered thereby, the parties agree that the court making such
determination shall have the power to reduce the duration and/or geographic area
of such provision and, in its reduced form, such provision shall be enforceable.

            (d) For purposes of Sections 4, 5 and 6 hereof, the "Company" shall
mean Jupiter Communications, Inc. before the closing of the Merger, and Media
Metrix and Jupiter Communications, Inc., and their respective subsidiaries, upon
the closing of the Merger and thereafter.

      8.    Termination and Severance.

            Notwithstanding the provisions of Section 2 of this Agreement, the
Executive's employment hereunder may terminate under the following
circumstances:

            (a) Termination by the Company for Cause. The Company may terminate
this Agreement for Cause at any time, upon written notice to the Executive
setting forth in reasonable detail the nature of such Cause. For purposes of
this Agreement, Cause is defined as (i) the Executive's conviction of any felony
or any crime involving moral turpitude; or (ii) the Executive's willful refusal
to perform his duties hereunder or the lawful directives of the Board,

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after thirty (30) days' written notice and opportunity to cure. A termination of
the Executive's employment hereunder for Cause shall occur only through a
majority vote of the Board after the Executive has been afforded an opportunity
to appear before the Board, with counsel, to present his position. Upon the
termination of the Executive's employment hereunder for Cause, the Company shall
have no further obligation or liability to the Executive other than for Salary
and bonus earned under this Agreement prior to the date of termination, and any
accrued but unused vacation.

            (b) Termination by the Company Without Cause. The Executive's
employment hereunder may be terminated without Cause by the Company upon written
notice to the Executive, provided, however, that if the Company terminates the
Executive's employment without Cause, or the Executive terminates his employment
for Good Reason, as defined below, the Company shall, in addition to providing
the payments required upon a termination pursuant to Section 8(a) above, (i)
continue to pay the Executive the Salary and shall provide health coverage,
under the same conditions as exist at the time of termination, for a period of
eighteen (18) months, or until the Expiration Date, whichever is longer; and
(ii) as to stock options granted by the Company to the Executive hereunder or
granted after the Effective Date ("Acceleration Options"), any portion of such
Acceleration Options which is unvested shall accelerate and vest in full, and
the Executive shall be permitted to exercise vested Acceleration Options up to
one (1) year after the effective date of the termination.

            (c) Termination by the Executive. The Executive may terminate his
employment hereunder at any time without Good Reason upon one (1) month's
written notice to the Company. Upon the termination of the Executive's
employment hereunder by the Executive without Good Reason, the Company shall
have no further obligation or liability to the Executive other than for Salary
and bonus earned under this Agreement prior to the date of termination, and any
accrued but unused vacation. The Executive may also terminate his employment
hereunder for "Good Reason," within ninety (90) days of the occurrence of any of
the following events (i) a material breach of this Agreement by the Company;
(ii) a material reduction in the Executive's title, duties or responsibilities
or the assignment to the Executive of duties inconsistent with his position, as
specified in Section 1 hereof; (iii) a change in the Executive's reporting
relationship so that he no longer reports directly to the Chief Executive
Officer or the Board; or (iv) a relocation of the Executive's worksite to a
location outside of New York County, New York. The Executive shall give the
Company thirty (30) days' written notice and opportunity to cure prior to any
termination for Good Reason.

            (d) Death. In the event of the Executive's death during the Term of
this Agreement, the Executive's employment hereunder shall immediately and
automatically terminate, and the Company shall have no further obligation or
duty to the Executive or his estate or beneficiaries other than for the Salary
and bonus earned under this Agreement to the date of termination and any
payments or benefits due under Company policies or benefit plans.

            (e) Disability. The Company may terminate the Executive's employment
hereunder, upon written notice to the Executive, in the event that the Executive
becomes disabled during the Term through any condition of either a physical or
psychological nature and, as a result, is, with or without reasonable
accommodation, unable to perform the essential functions of the services
contemplated hereunder for (a) a period of ninety (90) consecutive days, or (b)
for

                                       6
<PAGE>
shorter periods aggregating one hundred twenty (120) days during any twelve (12)
month period during the Term. Any such termination shall become effective upon
mailing or hand delivery of notice that the Company has elected its right to
terminate under this subsection 8(e), and the Company shall have no further
obligation or duty to the Executive other than for Salary and bonus earned under
this Agreement prior to the date of termination and any payments or benefits due
under Company policies or benefit plans.

            (f) Effect of Non-Renewal. In the event that the Company gives
notice of its election not to extend the Term of the Agreement for a Renewal
Period pursuant to Section 2 above, such non-renewal shall not be considered a
termination without Cause or an event constituting Good Reason, and the Company
shall continue to pay the Executive full compensation as defined in Section 3 of
this Agreement from the date the Executive receives such notice through the
Expiration Date. The Executive shall not be entitled to any additional
compensation upon such a non-renewal other than any payments or benefits due
under Company policies or benefit plans.

      9.    Choice of Law.

            The validity, interpretation and performance of this Agreement shall
be governed by, and construed in accordance with, the internal law of New York,
without giving effect to conflict of law principles.

      10.   Miscellaneous.

            (a) Assignment. The parties acknowledge and agree that the rights
and obligations of the Company under this Agreement may be assigned by the
Company to any successors in interest and shall be assigned to and assumed by
Media Metrix upon the closing of the Merger. The Executive further acknowledges
and agrees that this Agreement is personal to the Executive and that the
Executive may not assign any rights or obligations hereunder.

            (b) Withholding. All salary and bonus payments required to be made
by the Company to the Executive under this Agreement shall be subject to all
withholding required by law.

            (c) Entire Agreement. This Agreement sets forth the entire agreement
between the parties and, as of the Effective Date, supersedes any prior
communications, agreements and understandings, written or oral, with respect to
the terms and conditions of the Executive's employment other than any written
agreements executed by the parties in connection with the grant of stock options
to the Executive by the Company.

            (d) Amendments. Any attempted modification of this Agreement will
not be effective unless signed by an officer of the Company and the Executive.

            (e) Waiver of Breach. The Executive understands that a breach of any
provision of this Agreement may only be waived by an officer of the Company. The
waiver by the Company of a breach of any provision of this Agreement shall not
operate or be construed as a waiver of any subsequent breach.

                                       7
<PAGE>
            (f) Severability. If any provision of this Agreement should, for any
reason, be held invalid or unenforceable in any respect by a court of competent
jurisdiction, then the remainder of this Agreement, and the application of such
provision in circumstances other than those as to which it is so declared
invalid or unenforceable, shall not be affected thereby, and each such provision
of this Agreement shall be valid and enforceable to the fullest extent permitted
by law.

            (g) Notices. Any notices, requests, demands and other communications
provided for by this Agreement shall be in writing and shall be effective when
delivered by private messenger, private overnight mail service, or facsimile as
follows (or to such other address as either party shall designate by notice in
writing to the other in accordance herewith):

            If to the Company:

            21 Astor Place
            New York, New York 10003
            Attention:  General Counsel

            With a copy to:

            Brobeck, Phleger & Harrison LLP
            1633 Broadway
            New York, New York 10019
            Attention:  Richard Gilden

            If to Executive:

            90 Hudson Street, #7A
            New York, New York 10013

            (h) Survival. The Executive and the Company agree that certain
provisions of this Agreement shall survive the expiration or termination of this
Agreement and the termination of the Executive's employment with the Company.
Such provisions shall be limited to those within this Agreement which, by their
express and implied terms, obligate either party to perform beyond the
termination of the Executive's employment or termination of this Agreement.

            (i) Headings. The parties acknowledge that the headings in this
Agreement are for convenience of reference only and shall not control or affect
the meaning or construction of this Agreement.

                                       8
<PAGE>
      IN WITNESS WHEREOF, the undersigned have duly executed this Agreement as
of the day and year set forth above.

EXECUTIVE                                 JUPITER COMMUNICATIONS, INC.

 /s/ Gene DeRose                          By: /s/ Jean Robinson
--------------------------------             ---------------------------------
GENE DEROSE
                                          Title: Chief Financial Officer
                                                 -----------------------------

                                       9

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