So.. From what i understood there, this is what's happening at best...
facebook will let Oculus guys have fun with their lil pc games (fb doesn't give a shit), while they will help them making the tech future worthy, so they can sell virtual media (sport streams, videoconfs, touristic vists...) to people at some point.
Am i right ?
Facebook did it to piss of neogaf. Don't think for a second there is another reason.