Via Dow Jones: “[Tim] Armstrong [Google’s North American president for advertising and commerce]…said Google has established engineering and sales teams dedicated to figuring out how to make money from advertisements on social networking sites…he said it became clear that user behavior on social networks was different than on traditional sites and the company has now carved out teams dedicated to monetizing those sites. “We now have a very clear path and direction for it,” he said.
Source: Google: To Be `Very Significant’ in Display Ads By ’08-’09. Scott Morrison. Dow Jones. March 120, 2008