Mark Zuckerberg once promised Facebook would move fast and break things. Now Zuckerberg says Facebook is trying to fix the things it broke. Standing on stage before an audience of developers at the annual F8 Conference on Tuesday, Zuckerberg—the same guy who spent years convincing billions of people to share their every thought and action with the world—explained all the ways Facebook is going to help people keep that same information under wraps.

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