I suppose this post is " Available to everyone on Facebook ", which may be the reason why Facebook is accepting a user access_token (i.e. Viewing the post as a user) and not accepting an application access_token .
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.