• by Laurie Sullivan , Staff Writer @lauriesullivan, September 21, 2009

CEO and Cofounder comScore Magid Abraham opened OMMA Global New York during Ad Week this morning talking about social networks. He says CPMs are dropping because the supply of ads continue to explode. Social networks contribute to that phenomenon. They account for 21% of the total impressions online, but 3.5% of dollars. Social network dominates impressions. Advertising on social networks is primarily direct response advertising, dominated by telecommunications. Three of the top 10 advertisers on social networks are wireless or telecom carriers. The top branding advertising are missing. the highest ranked at 42 is Unilever.