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September 19, 2014

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In this July 9, 2011, file photo, Mark Zuckerberg, president and CEO of Facebook, walks with Priscilla Chan during the 2011 Allen and Co. Sun Valley Conference in Sun Valley, Idaho.

Julie Jacobson / AP

In this July 9, 2011, file photo, Mark Zuckerberg, president and CEO of Facebook, walks with Priscilla Chan during the 2011 Allen and Co. Sun Valley Conference in Sun Valley, Idaho.