Cyber-stalking, or just another day on Facebook?

So, I want to add a girl as friend on FB that I met 3 weeks ago at a bar, maybe 4, in the hopes that someday she'll be single and then we can date. Is this cool? or creepy? Or does the fact that facebook itself is inherently creepy negate that? Isn't it weird that we meet people now, don't get their number, but then add them as a "friend" the next day on an online social networking site? There's no pre-internet version of this--you either got someone's digits or you didn't. Well, I guess you could stalk them in class, if you were still in school, but Facebook seems acceptable, whereas following them around a school would be entirely out of control. Facebook has made a certain degree of sketchiness acceptable. We're all stalkers now.

And that's just the beginning. In the real world, you might never see this person again, but on Facebook, you can keep track of THEIR WHOLE LIVES with just a click. You used to meet someone and have them pass along, but now, you can monitor them forever. Nothing is let go, everyone is retained in some sort of weird rolodex that not only has their name and number but personality type, recent photos and relationship status updates.

Back to this girl, though. What can I really expect: that in a month or two she does break up with her current boyfriend, remembers that I friended her and hit me up for drinks? Or should I keep track and strike once she's single again, never talking in the meantime because we really don't have that much to go on? And doesn't that last option signifry that I should just let it go, and get digits next time? Alas.