What was interesting was that I once got into an online sparring with a celebrity, who was being harassed on her Facebook page. She assumed I was the one doing it, I assumed she was a troll, the 2 trolls who set that up were laughing their ***** off.
When the dust cleared, I had spoken with said celebrity on the phone, I found out it was really her, she found out that I wasn't the troll, and the 2 trolls were banned off of Facebook.
At the end, it was kind of cool, to talk to a celebrity...but at the same time, not cool, because I didn't like that she thought I was dissing her, when I was actually a fan.
I agree that Facebook is a playground for online trolls. They do it for the LOLZ, or whatever. I personally hate cyber bullying, so I report every single abusive post or page that comes up (not sure if it actually helps, though.)