EXHIBIT
      10.1

    


    SECOND
      ADDENDUM TO AGREEMENT AND PLAN OF MERGER AND REORGANIZATION DATED MARCH 20,
      2008
      AMONG SINGLE TOUCH SYSTEMS INC. (FORMERLY KNOWN AS HOSTING SITE NETWORK, INC.),
      SINGLE TOUCH ACQUISITION CORP. AND SINGLE TOUCH INTERACTIVE,
      INC.

    


    This
      Addendum is made and entered into as of the 10th
      day of
      June 2008. Unless otherwise defined herein, capitalized terms used in this
      Addendum shall have the meaning given to them as in the Agreement and Plan
      of
      Merger and Reorganization (the “Merger Agreement”).

    


    WHEREAS,
      at the time of execution of the Merger Agreement, the parties contemplated
      that
      there would be approximately 2, 292,826 common shares of Parent issued and
      outstanding at the time of closing under the Merger Agreement after taking
      into
      account the prior effectuation of a 2.3:1 reverse stock split (the “Reverse
      Split”) and the cancellation of the Parent Common Stock owned by Parent’s
      current president, Scott Vicari (the “Share Cancellation”), but excluding (i)
      the shares of Parent Common Stock underlying the convertible notes to be issued
      in Parent’s Private Placement Offering including the shares of Parent Common
      Stock underlying the Class A Warrants and Class B Warrants issuable upon
      conversion of the convertible notes (the “Note Shares”) and (ii) the issuance of
      the Merger Shares to be issued to the Company’s stockholders, and the holders of
      Company Warrants and Company Notes (upon the execution or conversion of such
      Company Warrants and Company Notes) in connection with the Merger (the “Company
      Stockholder Merger Shares”); and

    


    WHEREAS,
      the parties have determined that there should be approximately 6,878,478 common
      shares of Parent issued and outstanding at the time of Closing under the Merger
      Agreement after taking into account the Reverse Split and the Share Cancellation
      but excluding the issuance of the Note Shares and the Company Stockholder Merger
      Shares; and

    


    WHEREAS,
      to accomplish same, Parent shall effect a 3:1 forward stock split (the “Forward
      Stock Split”) in the form of a dividend prior to the Closing; and

    


    WHEREAS,
      the holders of the convertible notes of Parent have agreed that the Forward
      Stock Split will have no effect on the unit conversion price of the Convertible
      Notes or the exercise prices of the Class A Warrants and Class B Warrants
      underlying the Convertible Notes.

    


    NOW,
      THEREFORE, in consideration of the respective covenants contained herein and
      intending to be legally bound hereby, the Parties hereto agree as
      follows:

    


    1. The
      second clause of the Merger Agreement is amended to read as
      follows:

    


    “WHEREAS,
      following the execution of this Agreement, Parent shall engage in a private
      placement (the “PPO”) of Parent Convertible Notes in the maximum principal
      amount of $3,300,000. The proceeds therefrom shall be loaned to the Company
      (the
“STI Loans”) pursuant to the terms of a Bridge Loan Agreement. The Notes shall
      be convertible into Company units (the “Units”) at a conversion price of $1.25
      per Unit, each unit consisting of (i) one share of the Parent’s common stock,
      (ii) one Class A Warrant to purchase one share of Parent’s common stock at an
      exercise price of $1.60 per share at any time during a period of eighteen months
      from issuance; and (iii) one Class B Warrant to purchase one share of Parent’s
      common stock at an exercise price of $2.05 per share at any time during a period
      of three years from issuance (the Unit and Warrant prices indicated above take
      into account a 2.3:1 reverse stock split and 3:1 forward stock split in the
      form
      of a dividend intended to be effected by the Company prior to the
      Merger);”

    


    
      
         

      

      
         

        
          

        

      

      
         

      

    

    2. Section
      3.2 of the Merger Agreement is amended to read as follows:

    


    “3.2 Capitalization.
      The
      authorized capital stock of the Parent consists of 100,000,000,000 shares of
      Parent Common Stock, of which 8,273,500 shares are issued and outstanding as
      of
      the date of this Agreement and 5,000,000 shares of preferred stock, $0.001
      par
      value per share, of which no shares are issued and outstanding. At or prior
      to
      the Closing, the 3,000,000 shares presently owned by the Company’s president,
      Scott Vicari, will be cancelled. Prior to Closing, the Company will effect
      a
      2.3:1 reverse stock split and a 3:1 forward stock split in the form of a
      dividend such that at the time of Closing, the Company will have approximately
      6,878,478 shares of Parent Common Stock issued and outstanding without taking
      into account the shares of Parent Common Stock issuable to Company stockholders
      and holders of Company Warrants and Company Notes at Closing or the shares
      of
      Parent Common Stock issuable to holders of Parent Convertible Notes at Closing.
      The Parent Common Stock is presently quoted on the Over-the-Counter Bulletin
      Board (the “OTCBB”) and is not subject to any notice of suspension or delisting.
      All of the issued and outstanding shares of Parent Common Stock are duly
      authorized, validly issued, fully paid, nonassessable and free of all preemptive
      rights. There are no outstanding or authorized options, warrants, rights,
      agreements or commitments to which the Parent is a party or which are binding
      upon the Parent providing for the issuance or redemption of any of its capital
      stock. There is no outstanding or authorized stock appreciation, phantom stock
      or similar rights with respect to the Parent. There are no agreements to which
      the Parent is a party or by which it is bound with respect to the voting
      (including without limitation voting trusts or proxies), registration under
      the
      Securities Act, or sale or transfer (including without limitation agreements
      relating to pre-emptive rights, rights of first refusal, co-sale rights or
      “drag-along” rights) of any securities of the Parent. There are no agreements
      among other parties, to which the Parent is not a party and by which it is
      not
      bound, with respect to the voting (including without limitation voting trusts
      or
      proxies) or sale or transfer (including without limitation agreements relating
      to rights of first refusal, co-sale rights or “drag-along” rights) of any
      securities of the Parent. All of the issued and outstanding shares of Parent
      Common Stock were issued in compliance with applicable federal and state
      securities laws. The Merger Shares to be issued at the Closing pursuant to
      Section 1.5 hereof, when issued and delivered in accordance with the terms
      hereof and of the Certificate of Merger, shall be duly and validly issued,
      fully
      paid and nonassessable and free of all preemptive rights and will be issued
      in
      compliance with applicable federal and state securities laws. Furthermore,
      the
      shares of Parent Common Stock underlying the Parent Notes and Parent Warrants
      have been duly and validly authorized and reserved for issuance, and when issued
      in accordance with the terms of the Parent Notes and Parent Warrants shall
      be
      duly and validly issued, fully paid and nonassessable and free of all preemptive
      rights and will be issued in compliance with applicable federal and state
      securities laws”. 

    


    
      
         

      

      
         

        
          

        

      

      
         

      

    

    3. Section
      5.3(g) of the Merger Agreement is amended to read as follows:

    


    “(g) the
      Parent shall have effected a 2.3:1 reverse stock split and a 3:1 forward stock
      split in the form of a dividend such that the total number of shares of Parent
      Common Stock issued and outstanding immediately prior to the Effective Time
      shall be approximately 6,878,478 shares, but excluding (i) the shares of Parent
      Common Stock underlying the Convertible Notes to be issued in the Private
      Placement Offering, and (ii) the issuance of the Merger Shares to be issued
      to
      Company Stockholders, and the holders of Parent Warrants and Parent Notes (upon
      the exercise or conversion of such Parent Warrants and Parent Notes) in
      connection with the Merger;”

    


    4. Section
      5.3(i) of the Merger Agreement is amended to read as follows:

    


    “(i) the
      Company shall have received a certificate of Parent’s transfer agent and
      registrar certifying that as of the Closing Date there are not more than
      6,879,000 shares of Parent Common Stock issued and outstanding;
      and”

    


    5. All
      other
      terms of the Merger Agreement shall continue with full force and
      effect.

    


    6. This
      Addendum may be executed in any number of counterparts, each of which shall
      be
      deemed to be an original, but all of which taken together shall constitute
      one
      and the same agreement.

    


    IN
      WITNESS WHEREOF, this Addendum has been executed by the Parties as of the date
      first above written:

    


    
      	
              PARENT:

            	 	 
	
              SINGLE
                TOUCH SYSTEMS INC.

            	 	 
	 	 	 
	
              By: /s/
                Scott Vicari   

            	 	 
	
              Name: Scott
                Vicari

            	 	 
	
              Title: President

               

            	 	 
	 	 	 
	
              ACQUISITION
                SUBSIDIARY:

            	 	
              COMPANY:

            
	
              SINGLE
                TOUCH ACQUISITION CORP.

            	 	
              SINGLE
                TOUCH INTERACTIVE, INC.

            
	 	 	 
	
              By: /s/
                Scott Vicari   

            	 	
              By: /s/
                Anthony Macaluso  

            
	
              Name: Scott
                Vicari

            	 	
              Name: Anthony
                Macaluso

            
	
              Title: President

               

            	 	
              Title: Chief
                Executive Officer