He's sending me mixed signals?

[Crystal R]

Let's be honest. Do you really want him to ask you to prom via facebook?! Seriously?
I'm going to give him the benefit of the doubt and say that maybe he's planning to ask you in a more creative way. Trust me, when people ask how he asked you to prom, you don't want to respond with "he facebook messaged me."
If he's shy, don't rush him. No one likes to be rushed into anything. If nothing happens, then try to move on. I know you want a date to prom, but it's never good to be desperate. (not saying you're desperate, just putting it out there). But good luck! If he really likes you, he'll put forth the effort!