Hot guy on Facebook...should I message him?

[Stephen]

I'm not familiar with the app Hot or Not. You say you filtered it for males - are you sure he filtered it the same way? Since you are both Facebook friends, you could message him - saying you were just reviewing your FB page and came across his name and thought you might like to get to know him. By chatting a little, you can get to know him better and by casual discussions, you can get to know if he's gay or not. Getting to know a person on a face to face basis is better (in my opinion) that doing it electronically. Of course if Hot or Not is definitely a gay site, then there's nothing to worry about. But do remember that once you share a secret with even one other person, it is no longer a secret.
Good luck.