ok I don't think that the gov't should be moderating huffpo comments. Upvote/downvote stuff might be good at least for trolling stuff (but it too can be abused in the right situations).
However, actions are actions. Just because it's easier to do something on the internet doesn't make it more legal.
Obviously the seriousness of it all has to be judged , but if you're harrassing someone constantly on the internet (even if it's "just" making a bunch of online accounts and commenting extremely viley everywhere), you do not have my sympathy.
If I were putting hateful messages into your (snail) mail box every day and sending your friends photoshopped pictures of you in compromising situations, would I be pardoned? Doing on the internet shouldn't either