Zuckerberg Makes Biggest Charitable Donation Yet Gives $500M in stock to health, education charity By Rob Quinn, Newser Staff Posted Dec 19, 2012 12:17 AM CST 16 comments Comments Facebook CEO Mark Zuckerberg smiles at the Allen & Company Sun Valley Conference earlier this year. (AP Photo/Paul Sakuma) (Newser) – Mark Zuckerberg has hit the "share" button on a sizable chunk of his fortune. In his biggest donation to charity yet, the Facebook founder has donated stock worth around $500 million to a Silicon Valley charitable foundation that funds educational and health initiatives, the Los Angeles Times reports. "Mark's generous gift will change lives and inspire others in Silicon Valley and around the globe to give back and make the world a better place," the foundation's CEO said. Zuckerberg pledged $100 million to Newark public schools in 2010.