Facebook has safeguards such as requiring a certain amount of friends in a certain network to add you before you actually become a part of that network (i.e. a high school network), and if you don't meet that quota in a certain amount of time they disconnect that account. Facebook also sets a limit on the number of friends you can add in an amount of time after you join their site, i think its about 100, more than that and you'd trigger flags and they shut you down and don't let you do stuff.

What percentage do you think are "real" accounts? (or anyone of course?)