cant remember where I heard it but they say if teenage girls fought the wars for us we'd never lose a battle as they can be the meanest to each other. I have a teenage daughter and I have seen how malicious they can be toward each other especially through the latter part of the middle school years. I think the instant messaging and the computer gives them a sense of power that they can say anything to each other and about each other. I am talking verbally of course not physically.
We had some kind of a parenting monitor on her computer and couldn't believe half of what we read. She has thankfully outgrown the nonsense now.

Sorry to take the subject off to the side a bit. Just my thoughts.