It's the xid parameter... if it's missing. Use it and problem is solved.
It may be a facebook issue...give it a couple of hours and try again. More importantly make sure you are using the recent comment tags as can be found here https://developers.facebook. Com/docs/reference/plugins/comments/ Use the form to generate your code and try it out.
It is old post, even though I don't know still you got an answer or not.. just in case I found the solution for same problem that's why I posting a solution here Answer available in below thread. Solution for the same problem in diff thread - 1199623.
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.