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"Facebook's\u00A0CEO Mark Zuckerberg and his wife, Priscilla Chan, have been crowned the most generous Americans in 2013 -- after they donated 18 million Facebook shares valued at more than ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/facebook/2014/02/10/facebooks-mark-zuckerberg-and-his-wife-were-the-most-generous-charity-donors-in-the-us-in-2013/>