Okay I'm going to have to agree with the above statement. I'm not great at PUA, but I have been working on my FB game and from what I've found at least with the american girl's I game, there is a much more readable response which is often the Bitch Shield.
Some tips:
It helps if you use a neg based opener - something that will put her on edge or piss her off. This serves two purposes. It garuntees you a response and it immediately sets the bar to guage the conversation. The biggest thing about facebook is that you only have soken game with vauge IOIs such as smiles and lols. I you can establish that the girl is feeling emotion you can work with it otherwise you've just goy pointless small talk. My favorite for valentine's day has been, "roses are red, violets are blue, I suck at poems, nice tits"
After this playfully neg the hell out of her, make her want to please you. But try to keep it joking. If she's loling or :)ing or hahaing or any other emoticon for that matter you're doing well. Even a

is good. She is going out of her way to tell you how she feels, but pay attenttion to context it may be a real

or a sarcastic one
Takeawy is also very useful here, generally you want to reply as quickly as they do. But occassionally you can take five or six minutes extra when the conversation is going well. It draws her to realize how much she's enjoying talking to and makes her want you to respond, thereby building an attachment
Finally FB game does not count unless it ends in a meet-up or a #-close, This may take time as most girls are very against giving thier number out online. Be patient sometimes it's a day, other times it's couple of weeks.
Also I find that it is always helpful to be busy. By this I mean never let her leave you set time constraints based on the conversation and let her know "I've gotta go in a little bit" then as you near your limit start looking for ways out , unless you are going to close. If you are just ending a segment of this gaming you want to end on something that causes her to have an emotional response. If you are closing, that is your out. The #-close i use is, "I've gotta get offline, but I can text/talk. If a certain woman was to say post her number, I guess I would be obliged to text/call her, wouldn't I?"
So far I've had about a 50% sucess rate. I attribute this to the fact that I've tried to close too soon. the longer I take the easier it is for me to make a #-close.
Hope I was helpful