How to delete all your Facebook posts and comments
Facebook and privacy have a complicated, ever-changing relationship, though things seem to be moving toward stability now that they've agreed to make sharing opt-in. Still, some folks may want to walk away from Facebook and leave no trace. Exfoliate is an Android app that lets you permanently take down all or some of your posts, likes, and comments from your own or your friends' walls.
14 Nov 2011 ... In either case, deleting more than a couple of posts or pictures can be a ... can scour your Facebook history and permanently delete some or all content. ... to work out the first time, try again with Background Override checked.