"We'll really be able to take reality apart and put it back together again when we understand the string theory," he says. "The $13 billion in and a few years in and nothing interesting yet? Feels a little string theory-ish, like everybody sure is there, but it's not." But at the same time, an interesting thing has happened. Facebook is trying to take we organic humans and put us into the fully digital immersed reality of virtual reality.