According to a comScore study of U.S. online display advertising on social networking sites in June 2009, social networking sites accounted for more than 20% of all display ads viewed online, with MySpace and Facebook combining to deliver more than 80% of ads among sites in the social networking category. Top Online Display Ad Publishers in Social Networking Category (June 2009 Total U.S.; Home/Work/University Locations)   Total Display Ad Impressions (MM) % Share of Display Ads Ad Exposed Unique Visitors (000) Total Internet Audience 326,899 100.0% 188,589 Social Networking 68,927 21.1 129,620 MySpace Sites 30,004 9.2 64,472 Facebook.com 26,813 8.2 67,389 Tagged.com 1,940 0.6 7,422 MocoSpace.com 496 0.2 1,067 Hi5.com 461 0.1 3,459 Bebo 435 0.1 6,350 Classmates.com Sites 400 0.1 9,181 BlackPlanet.com 345 0.1 2,084 GaiaOnline.com 258 0.1 1,859 DeviantArt.com 204 0.1 3,681 Source: comScore Ad Metrix, September 2009 Jeff Hackett, comScore senior vice president, said “… social networking … accounts for a significant portion of the time Internet users spend online and the pages they consume,… (and) advertisers are eager to use social networking sites as a new advertising delivery vehicle.” Read more at www.mediapost.com