RESTON, Va., Jan. 14 /PRNewswire-FirstCall/ -- comScore, Inc. (Nasdaq: SCOR), a leader in measuring the digital world today reported the top 15 ad networks based on their reach among U.S. Internet users in December 2009. The ranking showed that AOL Advertising remains the top ad network, reaching 187 million U.S. Internet users, or 91 percent of the total audience, followed by Yahoo! Network (180.9 million) and Google Ad Network (178.1 million). The fastest growing ad network by audience reach among the top 15 was Microsoft Media Network U.S., which grew 31 percent versus year ago, followed by Collective Network (up 22 percent) and Audience Science (up 16 percent).

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    Top 15 Ad Networks
    ------------------
    December 2009 vs. December 2008
    -------------------------------
    Total U.S. - Home/Work/University Locations
    -------------------------------------------
    Source: comScore Media Metrix
    -----------------------------
                                           Total Unique Visitors (000)
                                         ---------------------------
                                       Dec-2008     Dec-2009     % Change
                                       --------     --------     --------
    Total Internet : Total Audience      190,650      205,709            8
    -------------------------------      -------      -------          ---
    AOL Advertising                      173,804      187,023            8
    ---------------                      -------      -------          ---
    Yahoo! Network                       165,879      180,909            9
    --------------                       -------      -------          ---
    Google Ad Network                    157,131      178,134           13
    -----------------                    -------      -------          ---
     ValueClick Networks                 159,420      170,774            7
    -------------------                  -------      -------          ---
    Microsoft Media Network US           126,158      165,470           31
    --------------------------           -------      -------          ---
    Specific Media                       153,079      165,230            8
    --------------                       -------      -------          ---
    FOX Audience Network                     N/A      156,981          N/A
    --------------------                     ---      -------          ---
    24/7 Real Media                      142,448      155,856            9
    ---------------                      -------      -------          ---
    Collective Network                   126,294      153,905           22
    ------------------                   -------      -------          ---
    interCLICK                           137,076      148,989            9
    ----------                           -------      -------          ---
    Tribal Fusion                        139,778      147,169            5
    -------------                        -------      -------          ---
    AudienceScience (formerly
     Revenue Science)                    126,261      146,428           16
    -------------------------            -------      -------          ---
    Traffic Marketplace                  147,024      144,115           -2
    -------------------                  -------      -------          ---
    Adconion Media Group                 142,133      141,235           -1
    --------------------                 -------      -------          ---
    Turn, Inc                            123,150      138,297           12
    ---------                            -------      -------          ---

"Ad networks continue to be a powerful mechanism for delivering a large audience online, with eight different networks reaching at least 75 percent of the entire U.S. online population," said comScore senior vice president Jeff Hackett. "Increasingly, however, ad networks are improving their capability for reaching more targeted audiences as well, which delivers enhanced value to advertisers and helps sustain higher CPMs for the channel. 2010 should bring us continued innovation and performance from this growing online sector."

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SOURCE comScore, Inc.