One other thing that needs to be mentioned: for guys looking to "hook up" on FB, get that delusion COMPLETELY out of your head. There is almost no environment worse for a guy to approach/interact with a chick (except maybe a club where other idiots are distracting her/buying her drinks, etc.).
FB is a vast farmland for attention hoes, and will create some where there otherwise wouldn't be. Remember, men want sex, women want attention. FB allows the latter to be fulfilled without any risk of the former, which is why it is so popular with immature girls. And the hot girl with 786 "friends"? The guys she's actually banging aren't on her "friends" list, and never will be. Field-tested.