There's this boy I like and I think he may like me too. We have a lot in common. He likes/comments a lot I put on Facebook but that's because we have a joke between us where is likes to playfully tease me that I eat a lot. Do you think he likes me?

I don't really think so, but I don't know he might I don't know the whole story. If you want to know, flirt with him and see if he flirts back?(:

I'm too nervous to talk to him on chat though :-/

If he likes what you say on Facebook, then by definition, he likes what you say. If you have a running joke, then it stands to reason that he is at the very least friendly with you. Maybe he does like you and is trying to get the nerve to ask you out. If you like him, my advise would be to ask him out. If he says yes, great! If he says no, you've lost nothing. I know women have trepidation about asking guys out, but even if he says no, the experience will give you a greater perspective on what guys go through when they ask you out. The fear of rejection is a human condition, not a female condition.