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SAN FRANCISCO, CA - OCTOBER 07: Facebook Founder, Chairman and CEO Mark Zuckerberg speaks onstage during "Now You See It—The Future of Virtual Reality" at the Vanity Fair New Establishment Summit at Yerba Buena Center for the Arts on October 7, 2015 in San Francisco, California. (Photo by Michael Kovac/Getty Images for Vanity Fair)

SAN FRANCISCO, CA - OCTOBER 07:  Facebook Founder, Chairman and CEO Mark Zuckerberg speaks onstage during "Now You See It—The Future of Virtual Reality" at the Vanity Fair New Establishment Summit at Yerba Buena Center for the Arts on October 7, 2015 in San Francisco, California.  (Photo by Michael Kovac/Getty Images for Vanity Fair)

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PALO ALTO, CA - APRIL 07: Facebook CEO Mark Zuckerberg speaks during a media event at Facebok headquarters on April 7, 2011 in Palo Alto, California. Facebook announced the launch of the Open Compute Project that will open-source the specs of its new server and data center design. (Photo by Justin Sullivan/Getty Images)

PALO ALTO, CA - APRIL 07:  Facebook CEO Mark Zuckerberg speaks during a media event at Facebok headquarters on April 7, 2011 in Palo Alto, California. Facebook announced the launch of the Open Compute Project that will open-source the specs of its new server and data center design. (Photo by Justin Sullivan/Getty Images)

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LONDON, ENGLAND - AUGUST 03: A person holds an iPhone displaying the Facebook app logo in front of a computer screen showing the facebook login page on August 3, 2016 in London, England.  (Photo by Carl Court/Getty Images)