Barack Obama and Mark Zuckerberg
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Barack Obama and Mark Zuckerberg's Facebook 'face time'

20 April 2011 Last updated at 23:29 BST

US President Barack Obama visited Facebook's Silicon Valley headquarters for a town hall meeting, streamed live on the social networking site.

Mr Obama was joined by Facebook founder Mark Zuckerberg, with the multi-billionaire internet entrepreneur confessing that he was nervous about hosting the president's question and answer session.