It could mean he is trying not to stare at your eyes for too long to avoid being rude.
It could mean he has some sort of attraction towards you.
In science.. Hormones. In man talk... Always smell fresh, Good looks. great hair. muscles. And if you mean sexually, A large penis Body oil.
It means he likes you and wants you to make "the first move"
if she always trys to make conversation with you it means that she really likes you so therefore wants to talk to you and if she smiles it means she's happy to be with you
He's shy. If you like him, try to make him comfortable.
They like you but they're shy to express their feelings. and maybe they are just staring at something behind you.
That he's stupid.
Some people are not that involved in the internet. It is usually more rewarding to talk to people in person, than to talk to them through facebook.
Interesting Question, He is in love with you and wants to get your attention.
I think you will have to ask him to find out. He might not even realize he is doing that though.
The way it looks, it looks like it can be translated to: "What do you want to talk/speak (about)."
He only wants your looks!
In my predicament, I think the guy might like. I mean, who would stare all the time and not talk to you other than a crush?