I just tested your theory and it seemed to work as expected, only thing is I know all fields in "info" are filled it. Give that a try.
This may happen if you have filled invalid/incomplete/wrong og tags in past and later changed them. Facebook's cache creates problem sometime.
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.