If you have made a post to facebook through one of your apps, you can also delete that post from the same app. You need to get the post ID (it will be returned when you sucessfully do a post in the first place). Then issue a "DELETE" request.
http://developers.facebook.com/docs/reference/api/post.
When one of your users removes an app from the privacy settings interface, the app's access tokens are invalidated. This should be immediate.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.