When someone likes your page, the page gets completely refreshed and you would need to decode and inspect the signed_request HTTP POST parameter in server code (not javascript) to see if they like your page. Then from there you could redirect the user as necessary.
I asked the same question and gave bounty for it :))) You are lucky you can get the answer from this link.
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.