This article is a good explanation of why it is wise to moderate online discussions. "One was finding out the firm where Ciolli would be working upon graduation and pressuring it to withdraw its offer. It turned out to be the Boston law firm of Edwards, Angell, Palmer & Dodge, which in April rescinded its offer. The message board violated 'principles of collegiality and respect that members of the legal profession should observe in their dealings with other lawyers,' the firm’s managing partner, Charles DeWitt, wrote Ciolli."
The simple fact that they are anonymous is what gives them license to do this, if they were id'd then they'd never do any of this. Anonymity brings out the coward in people, and nowhere more so than online.