Companies will spend more than one in five U.S. ad dollars this year to purchase display ads in Facebook, displacing Yahoo for the first time as the No. 1 revenue generating site. David Hallerman, eMarketer principal analyst, estimates display ad revenue for the social network will rise 80.9% to $2.19 billion this year. Although Bing is gaining revenue, Google's share is still rising as the combined revenue at Microsoft and Yahoo continue to fall," he says.
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