I have a Sony Xperia Miro and uninstalled the Facebook App (which comes pre-installed. When I clicked "uninstall" it informed me,if I wanted to re-install, I must only re-install the Facebook factory version. I should have stopped there, but clicked to go ahead by mistake. Facebook is no longer in the list of "All" Apps, and I can't find how to get a factory installed version for the re-install.