Down the hall from Mark Zuckerberg’s desk sits a virtual reality studio. Foreign heads of state and other dignitaries have been known to lose themselves here in games of zero-gravity Ping-Pong and the real-seeming experience of firing virtual fireworks at each other. Such are their number, and frequency, that on an early summer morning Zuckerberg is at a loss to remember—or perhaps too diplomatic to divulge—one of their names. He does, however, recall the anecdotal nugget of the man’s visit.