This doesn't feel like an act of Facebook as a whole. They should be thinking long term, big picture. Zuckerberg seems to have an image of Neuromancer's Matrix in his head, and we ain't there yet. He'd definitely take this step but I wouldn't think he'd do it until he more solidly owns VR.

What I see here is a senior manager type, maybe a VP or a bit below it, who needs numbers that go dramatically up and to the right in the short term and is thinking about their own personal success. They'd be the ones to say "how do we turn this acquisition into Facebook-measurable success metrics so we can prove that we're worth all this spending? Ah, yes, mandate Facebook logins, great idea, do it."