I have logged into facebook many times, even having to start over a level 42 account way back when I first logged in. I'm level 47 now and it appeared I wasn't logged into facebook, so I was skeptical about it because I didn't want to lose so much progress. But, I logged in, and everything was fine, but I mostly did it for the 50 gems I was supposed to be given. Never showed up. If my gems can be transmitted somehow, I would very much appreciate it! (idk if this is even a bug but it seems like one to me)