• In the first quarter, 31% of all online display ads in the U.S. appeared on Facebook, almost double the share from a year ago, according to comScore Inc.

• Facebook ad prices rose in the first quarter - costing 40% more per click than in the previous three months, according to Efficient Frontier, an online ad performance firm.

Since the beginning of this year, Facebook launched sponsored stories, which allows advertisers to pay to republish user messages that mention companies to their Facebook friends.

Facebook has also expanded into non-advertising revenue streams selling local deals in five cities, putting it in direct competition with Groupon Inc. and other local deal providers.

Earlier this year, Facebook began requiring all companies that sell virtual goods on the site to use its Credits payments system, for which Facebook takes a 30% commission. Credits can be used to pay for such things as online games and movie rentals.

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