I am certain that your daughter wouldn't do something like this, if only because you're interested enough in what she's doing to know things like this. But to ask the obvious question...where are the other parents?
Granted, when I was 13, none of this technology existed. But I can't imagine the having the opportunity (never mind the motive) to "talk trash to men (women, in my case) online" for an extended period of time. Mom and Dad were pretty permissive, but they had a solid idea of pretty much where I was and everything that I had going on.
I guess to me, that's the way to change the moral center of the country....one kid at a time. My kids won't have the motive or opportunity to do stuff like this. Setting that standard and expecting my own kids to live up to it is a good start. Hopefully, their friends will follow the example my kids set.
I’m afraid to say that sometimes the parents help girls create accounts and even help their friends. I know girls who spend the whole day alone at home while parents work.
My daughter knows there are no such things as secrets on the computer. That includes me as well. All our computers are open. Mine is in my office because everyone complains about the shooting from Call of Duty but I usually keep the door open.