Okay, I admit I was hacked before. I was just on the Ouran wiki and some hacker or troll or whatever deleted the whole Tamaki Suoh page. I hadn't joined Wikia yet, and I noobishly commented, "I can't see it". Then, however, the troll started acting vulgar and cursing. He even revealed my name, and I was banned from Wikia for a while.
Sometimes you are going to be hacked, and this is when you should report to the Wikia administrators. They can help, and the trolls aren't going to go away if if you just ignore it.