I think that the biggest thing to remember about chatting it up on facebook is to not seem like a creeper. That is the worst, you'll lose any chance before you even have one. I also suggest talking to her over the facebook chat and not through messages (biggest thing being not to talk to her every time you see her on and don't message her as soon as you get on). I know in past experiences online sarging can be so much fun and so easy to build interest because you can be sitting there planning out every word you say. Online seduction is easy in those regards but face to face is much better. If I was you I'd just get the hb interested enough to want to go out to parties with you. From there it is easy. But yeah, keep your facebook talk to a minimum if possible because it is so easy to completely create a different you and then when you do hang out in person you might not be able to maintain the image that you've created! Good luck, hope I could be of some assistance.