In confused about certain boys at my school...?

[Dean]

On facebook people just "happy birthday" anyone on their friends list, even if they don't know them very well. At least that's how it works for me lol. But if his friends liked it, there could be a range of reasons for it. Maybe they dared him to do it as a joke, and now he's done it and they're liking it to embarrass him? LOL. Or maybe it was an inside joke (guys have all sorts of inside jokes, its nothing personal). Maybe he was just being friendly, and his friends are liking it to embarrass him (we do that alot).

He's 1-2 years older than you though, so that's a bit weird. It could mean anything, so it's impossible to know. To be honest I'd just ignore it, and ignore him at school (unless he talks to you or something, then ask him what all the likes meant).