I used to think that, too, John, but it's not that easy. When I was a kid, if there was a kid that was bullied, he was bullied by a handful of people, usually, and that was it. Now, it doesn't matter if a girl turns off her computer or not - the same viciousness and hatefulness is going on whether she's there to see it or not.
One cell phone camera + Facebook could potentially = destruction in a teenage girl's life. Girls are so mean, anyway. It's more girls than boys now. I have a very good friend whose daughter was being mercilessly bullied, because they didn't have a lot of money. They picked on her because of her phone. It was an older trac phone that her Dad gave to her, and put minutes on there so she could be like the other kids and have a cell phone. Thing was, the bitches at her school still made fun of her because it wasn't an iPhone. And it's not just going on in the halls at school. It happens online, with increasing frequency, and it gets spread until it goes viral in the school. Then, no matter if she was watching it happen online or not, the bullying gets worse in school, because she's being called names, laughed at, etc.
It's not just as easy as walking away. I always thought the same thing, but I was wrong.