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Mark Zuckerberg, chief executive officer of Facebook Inc., speaks during the Facebook F8 Developers Conference in San Francisco, California, U.S., on Wednesday, March 25, 2015. Zuckerberg plans to unveil tools that let application makers reach the social network's audience while helping the company boost revenue. Photographer: David Paul Morris/Bloomberg via Getty Images

Mark Zuckerberg, chief executive officer of Facebook Inc., speaks during the Facebook F8 Developers Conference in San Francisco, California, U.S., on Wednesday, March 25, 2015. Zuckerberg plans to unveil tools that let application makers reach the social network's audience while helping the company boost revenue. Photographer: David Paul Morris/Bloomberg via Getty Images

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Mark Zuckerberg, chief executive officer and founder of Facebook Inc., speaks during an event at the company's headquarters in Menlo Park, California, U.S., on Thursday, March 7, 2013. Zuckerberg discussed the social-network site's upgraded News Feed which includes bigger photos, information sorted into topics and a more consistent design across devices. Photographer: David Paul Morris/Bloomberg via Getty Images

Mark Zuckerberg, chief executive officer and founder of Facebook Inc., speaks during an event at the company's headquarters in Menlo Park, California, U.S., on Thursday, March 7, 2013. Zuckerberg discussed the social-network  site's upgraded News Feed which includes bigger photos, information sorted into topics and a more consistent design across devices. Photographer: David Paul Morris/Bloomberg via Getty Images

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Mark Zuckerberg, chief executive officer of Facebook Inc., listens as Narendra Modi, India's prime minister, not pictured, speaks during a town hall meeting at Facebook headquarters in Menlo Park, California, U.S., on Sunday, Sept. 27, 2015. Prime Minister Modi plans on connecting 600,000 villages across India using fiber optic cable as part of his 'dream' to expand the world's largest democracy's economy to $20 trillion. Photographer: David Paul Morris/Bloomberg via Getty Images

Mark Zuckerberg, chief executive officer of Facebook Inc., listens as Narendra Modi, India's prime minister, not pictured, speaks during a town hall meeting at Facebook headquarters in Menlo Park, California, U.S., on Sunday, Sept. 27, 2015. Prime Minister Modi plans on connecting 600,000 villages across India using fiber optic cable as part of his 'dream' to expand the world's largest democracy's economy to $20 trillion. Photographer: David Paul Morris/Bloomberg via Getty Images