Just read about this and thought I'd share it here since some of you work with FB. FB now asking some users to upload a clear phone of their face to verify their identity. It checks to see if the photo is unique then deletes it. It seems to be in beta mode with only some people getting it. The request will be sent when suspicious activity is detected - account creation, friend requests, ad related actions, etc. No details on what triggers the request right now, but possibly IP geo location.