Facebook's new Rooms app is weird, and it isn't long after installation that you figure out why. You don't log in with your Facebook credentials. Your profile picture appears nowhere. It doesn't tap into your contacts.
If Rooms' iOS-only App Store listing didn't proudly proclaim it was a Facebook product, you'd almost certainly never know it was brewed within the social giant's cavernous confines.
Seems a little off-kilter for a chat app, especially one with this pedigree. Instead, it just lets you create those eponymous Rooms - they're like those AOL chatrooms of yore, dedicated to any topic (or no topic at all) and augmented with the the ability to moderate posts like a power-tripping VIP on a forum.