Facebook chief technology officer Mike Schroepfer turned 40 last month. He (just barely) blew out a row of 40 candles during a mini-celebration at company headquarters, and Mark Zuckerberg posted a video to, yes, Facebook. "Schrep," as friends and colleagues call him, could share his huffing and puffing with anyone who wasn't there.

But what he really wants to do is share the moment in three dimensions, not just two. When friends and family view that video over the net, he wants them to step inside Mark Zuckerberg's conference room as the candles go out, not just watch on a phone.

That was the upshot of Schroepfer's keynote on Thursday at Facebook's annual developer conference in San Francisco. Like Zuckerberg the day before, he teased the idea of combining Facebook with the sort of virtual reality offered by Oculus, the startup Zuckerberg and company acquired last year.