Facebook founder, wife gave $970M away last year
                                
                                
                                    (Newser) -
                                    Mark Zuckerberg and his wife, Priscilla Chan, were the most generous American philanthropists in 2013, with a donation of 18 million shares of Facebook stock, valued at more than $970 million, to a Silicon Valley nonprofit in December. The Chronicle of Philanthropy says Zuckerberg's donation was the largest charitable...