** FILE ** 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. Zuckerberg and his wife, Chan, were the most generous American philanthropists in 2013, The Chronicle of Philanthropy reported, Monday, Feb. 10, 2014, with a donation of 18 million Facebook shares, valued at more than $970 million, given to a Silicon Valley nonprofit in December. (AP Photo/Julie Jacobson, File)
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