BURLINGAME, Calif. -- In a recent Q&A session with elementary school children, President Obama discussed the power of social media: "Be careful what you post on Facebook," he warned. "Whatever you do, it will be pulled up again later somewhere in your life."

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All told, a survey from the Pew & American Life Internet Project says that the percentage of adult Internet users who have profiles on social networks quadrupled to 35% in 2008 from 8% in 2005.

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