My app was rejected by apple because of "cluttered UI." They didn't like that the facebook login popup was sideways (landscape game, portrait login screen) and the keyboard covers part of it. Is there a way to correct the rotation issue? Do we need to wait for another facebook unity package update? I got a previous version approved without issue. Maybe it's just luck if you sneak by the review board, unless the device is already logged in to facebook.
It was fixed in Facebook sdk 6.2(now in beta).