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FILE- In this Sept. 22, 2011, file photo Facebook CEO Mark Zuckerberg talks about an old Facebook web site during the F8 conference in San Francisco. Naomi Gleit, Facebook's longest-serving employee after the CEO, said Zuckerberg has been talking about making the world a better place since he was 21. But his view of that world and his place in it "seemed almost like a gravity, a burden of responsibility," she said. (AP Photo/Paul Sakuma, File)