I have connected to Facebook, and two of my friends who play Bingo show up. However, one friend that does play (and is connected to FB as well) doesn't show up and I don't know why. I show up for him and he can send me gifts and I can accept, but I can't return them and he isn't listed under Social for me. I have tried logging out and reconnecting to FB, force closing the app; not sure what else to do. Suggestions?