Is it okay to ask a girl out via Facebook?

[Dragon Master]

I meet this girl in our school's recycling club (Basically, we help sort through the bins) and we talked a bit so we know each other. I want to ask her out and I got two tickets to see this show at a theater in a few days and I was going to ask her out there today. But, it turns out, the meeting was moved up a few days and no one told me so I never got the chance. Today was the last final so I won't get to see her again until January. I don't have her phone number or anything, but I found her on Facebook. Would that be an acceptable way to ask her out since I'm out of options or did I just miss my chance?

[Shereen Mahmood]

Yes you can ask her out via facebook and no you did not miss your chance , at least not yet.
good luck