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By 2011, ad spending on social networks is expected to reach $2.4 billion, down from an earlier projection of $2.7 billion made in December.

The slowing economy and the struggle by social networks to develop successful ad models have led to lowered ad spending projections for the next few years, according to eMarketer.

Spending on social networks includes display, search and video ads, as well as any fees that marketers pay to social networks to develop profile pages or conduct promotions.

The new projections also include widget and application ad spending

Forrás: http://www.btobonline.com/apps/pbcs.dll/article?AID=/20080513/FREE/144876094/1087