My best guess is that they’ve seen the signs that Facebook’s ubiquity is good for a few more years but is ultimately headed the way of MySpace, and they’re looking to transition from a social networking company to a vague, generalized “technology” company like Google, Apple, Microsoft, and Yahoo.
Which does mean they’re not necessarily going to shoehorn Facebook into the Rift. But I can just as easily see them pulling a Google+ and trying to force Facebook into as many unrelated sectors as possible.
