Facebook wants to do something like GoogleGlass with the rift, which is kind of silly considering GoogleGlass already exists. The thing about social media that's attractive is it's portability, and something that activly blocks your vision is dare I say, stupid. But I mean, think about the function of the Rift, to be able to move seperate objects in independant directions through a 3d space hands free. How would a company like Facebook even be able to implement this without branching their company in some new direction. If FB is throwing that kind of money around, it's a pretty safe bet they already have plans for the technology. There's no way Zuckerburg dropped $2billion for an enhanced reality social media device with hands free 3d movement, because that's ****ing insane. That's something an insane person would do with $2billion.
Also, fun little fact: The deal included $400million in cash and $1.6 billion in Facebook stock, so essentially over 3/4 of the pricepoint is nothing more than volatile toilet paper.