Does he like me and if so, When will he ask me out?

Okay, well, this boy in my class always talks to me on Facebook, and before summer he was always teasing me, but not mean, he always smiles when he talks to me, even when he's teasing, and it's not a mean smile. In my class him and his friend made up a game for all close friends called "Mexican Food Names" where every Mexican in the class (That we talk to) get a Mexican food name. Well, I was the first girl to play, he invited me, and unlike every other person, he picked my name. He wouldn't let me do it. Now, he's my friend on facebook, and every time he's on he is always the one that starts the conversation. And when we joke, I started giving him different names and he says he likes them. And if I forget one name or spell it wrong he pretends to be sad. Does he like me? And if so, do you think he'll ask me out soon? (I'm usually really good at giving this kind of advice, but this time I'm not sure.)