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May 20, 2009

comScore Releases April 2009 U.S. Ranking of Top 25 Ad Networks

RESTON, Va., May 20, 2009 /PRNewswire-FirstCall via COMTEX News Network/ -- comScore, Inc. (Nasdaq: SCOR), a leader in measuring the digital world today reported the top 25 ad networks based on their reach among U.S. Internet users in April 2009. The ranking showed that AOL's Platform-A remains the top ad network, reaching nearly 176.5 million U.S. Internet users, or 91.5 percent of the total audience, followed by Yahoo! Network (167.1 million) and Google Ad Network (164.5 million). New ad network FOX Audience Network ranked sixth, reaching 149.2 million people. Several ad networks in the top 25 achieved double-digit growth during the past year, led by Turn Inc. (up 121 percent), CPX Interactive (up 88 percent) and 24/7 Real Media (up 48 percent).

(Logo: http://www.newscom.com/cgi-bin/prnh/20080115/COMSCORELOGO)

    Top 25 Ad Networks
    April 2009 vs. April 2008
    Total U.S. - Home/Work/University Locations
    Source: comScore Media Metrix

                                               Total Unique Visitors (000)
                                            Apr-2008    Apr-2009    % Change
    Total Internet : Total Audience          190,728     192,875           1
    Platform-A                               170,508     176,455           3
    Yahoo! Network                           160,206     167,129           4
    Google Ad Network                        155,882     164,518           6
    ValueClick Networks                      140,930     160,307          14
    Specific Media                           144,773     158,012           9
    FOX Audience Network                         N/A     149,249         N/A
    24/7 Real Media                           99,959     147,668          48
    Traffic Marketplace                      114,682     143,519          25
    Microsoft Media Network US               119,595     139,674          17
    Tribal Fusion                            135,113     138,274           2
    Casale Media - MediaNet                  127,184     137,884           8
    interCLICK                               107,961     134,834          25
    Turn, Inc                                 60,617     134,028         121
    Adconion Media Group                     117,965     133,498          13
    CPX Interactive                           69,178     130,370          88
    Collective Network by Collective Media    88,279     129,808          47
    ADSDAQ by ContextWeb                      93,815     123,534          32
    AudienceScience (formerly Revenue
     Science)                                    N/A     121,001         N/A
    Burst Media                               89,670     116,727          30
    Undertone Networks                        72,940      97,053          33
    AdBrite                                   81,838      91,033          11
    Pulse 360                                    N/A      82,574         N/A
    Vibrant Media                             72,351      80,779          12
    Adify                                        N/A      73,467         N/A
    Kontera                                   52,159      72,870          40



"Underscoring the growing importance of ad networks to the digital advertising economy, each of the top 25 ad networks has expanded its reach during the past year," commented Jack Flanagan, comScore executive vice president. "It almost seems that new ad networks are emerging every day, each aimed at helping advertisers achieve their campaign objectives, whether it's to deliver reach and frequency or to target a specific audience segment."

About comScore

comScore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence. For more information, please visit www.comscore.com/companyinfo.

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SOURCE comScore, Inc.

http://www.comscore.com

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