I like him, but I don't really know him?

So I go to dance cles on Saturdays and Sundays. I've been dancing for 4 years now. Occasionly we do performances at parties and banquet halls. Then our dance group had to do a performance with another group which are guys. We have to lip sync a song and dance, and its a love song. He was my partner and we were really into the song. It looked like he kind of liked me too but I couldn.t really tell. It was a lot of fun when we performed on stage. Ever since then I can't forget about him and that performance was back in August 2010. Sometimes I see him at dance cl because his groups cl comes after mine. He smiles at me sometimes. I really like him now but I barely know him. I even looked him up on Facebook but I'm too afraid to add him because what if he doesn't like me and he just thinks I'm a stalker. I don't know what to do! I really like him but how do I get to know him better. I can't just randomly start talking to him cuz my older brother is in the same cl as him and he doesn't like he guy that much. Help me!!