My wife has the Facebook App on her phone. She had her login info being used on it and everything was fine. She let my son login to check something but when he logged out and she logged back in, she kept getting notifications in her notification bar at the top for his account, even though when she clicked on them she couldn't see the actual notification. She removed the app and got nothing but when she reinstalled the app and signed back in to her account, she again was getting notifications for his account. Anyone have any ideas other than doing a factory wipe?