comScore Releases December 2009 Ranking of Top Ad Networks

AOL Advertising Ranks #1 Among Ad Networks, Followed by Yahoo! Network and Google Ad Network

RESTON, VA – comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world 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).

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.”

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