I can't find my facebook app. I installed 4.5 last night, and made sure that it was checked to be backed up. It reinstalled, and I see it in my service books. However I don't see it in my icons. When I click show all, its not there either. I tried to re-download it, but it says do I want to replace? I click no, but I don't can't find it. Any ideas on how to get it back?