Mark Zuckerberg, co-founder and chief executive officer of Facebook Inc., arrives at a press event at Facebook headquarters in Palo Alto, California, U.S., on Wednesday, July 6, 2011. Facebook Inc., the world's largest social-networking service, is offering free video calls over its site through a partnership with Skype Technologies SA. Photographer: David Paul Morris/Bloomberg *** Local Caption *** Mark Zuckerberg Photo: David Paul Morris, Bloomberg
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