What does it mean when a guy wishes you a Happy B-day via a private message on Facebook?

Anonymous
It was my birthday yesterdag and as you all know you get a lot of messages on your wall on Facebook. But there was this guy from my class who sent me a private message to congratulate me. And afterwards we talked for an hour or so. But my question is 'Why would he congratulate me in a private message instead of just posting on my wall?'. Ok I know that some people sent a private message because they know that person well. But the thing is, we never talk to each other, not even on school so I don't get why he would send me a private message. And, I almost forgot, I asked my friends who are also in the same class if they got a private message from him for their birthday, but they didn't. He didn't even congratulate them. So what do you think this means or do you think this means nothing?
It means nothing
He was just being polite
He may like you
He definitely likes you
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What does it mean when a guy wishes you a Happy B-day via a private message on Facebook?
41 Opinion