According to Reuters, Facebook is the No. 1 website in the United States by page views, but it is a relatively small player in the online ad market. That fact must keep Zuck up at night. Here's another one: Facebook's revenue is somewhere in the half a billion range, whereas Yahoo earned $6.5 billion and Google earned $24 billion in 2009. Oh, the restless San Francisco nights... Enter Facebook's Open Graph project …
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