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The idea of girls administering a vicious beating so they can post the video online may seem shocking, but it's becoming an increasingly common scenario, according to experts and news reports.
Another example was also in the news this week: A high school art teacher in Baltimore told police a female student beat her up last week, and a video of the attack was posted on YouTube, according to CNN affiliate WBAL.
A search for "girl fight" on YouTube gets thousands of results, and a suggestion to also try "girl fight at school, boy girl fight" and other search terms. There's at least one Web site devoted exclusively to videos of girls fighting.
In 2003, 25 percent of high school girls said they had been in a physical fight in the past year, according to a survey by the Centers for Disease Control and Prevention. (The figure for boys was 40.5 percent.)

Lipkins, the psychologist, says there's a "disconnect between their actions and their thoughts."
"They think the entire society is doing it, and they think it's funny. So they put it on YouTube. And I don't think they expect kids to get really hurt, and they also don't expect to get really caught

Fonte CNN