The like button often represents more than just likes from a user click, it includes share count, send count, tagged count etc: so this number will often be different from the user like object count in graph api.
Shawn is right. The insight document says...
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.