Barack Obama last week warned ninth graders he was visiting in Arlington, Va, “be careful about what you post on Facebook, because in the YouTube age, whatever you do, will be pulled up again later somewhere in your life.”

That doesn’t seem to faze the more than 76 million social network users in the U.S., expected to morph to more than 95 million by 2013 and to generate $3 billion in advertising revenues (up from about $700 million in 2009), according to Parks Associates. Those financially profiting from social networking today — such as Craigslist, LinkedIn and Amazon — have demonstrated that they get how it works.

From the article, "Facebook's Positive Cash Flow: Social Media Means Business" by Diane Mermiga

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