see more

Attendees wait for the Facebook F8 Developers Conference to begin in San Francisco, California, U.S., on Wednesday, April 30, 2014. Facebook Inc. will offer software developers improved tools to create programs that run on any smartphone and a more streamlined experience for people to log into apps, including the option to sign in anonymously. Photographer: Erin Lubin/Bloomberg via Getty Images

Attendees wait for the Facebook F8 Developers Conference to begin in San Francisco, California, U.S., on Wednesday, April 30, 2014. Facebook Inc. will offer software developers improved tools to create programs that run on any smartphone and a more streamlined experience for people to log into apps, including the option to sign in anonymously. Photographer: Erin Lubin/Bloomberg via Getty Images