According to http://developers.facebook.com/bugs/332619626816423 you cannot create prefilled posts. But... If your EXTRA_TEXT contains valid URL then facebook client finds the url and prepares it. All the user has to do is put in some words of his own.
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.