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, January 14, 2010 – 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).

Top 15 Ad Networks
December 2009 vs. December 2008
Total U.S. – Home/Work/University Locations
Source: Comscore MMX

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 www.comscore.com/companyinfo.

Press
Bill Daddi
Daddi Brand Communications
646-370-1341
press@comscore.com

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