Online harrassment

We have many times to use internet and we often join online community like blog, bbs. When we write some comments for those community, we can' t need to write name. This good point is we don't worry about our privacy. But some bad hearts people ill-use this good point. They put adult sites links and picture, others slanders and so on. I'm always sad when I see these notes. Some people must be hurt. Perhaps someone already died. Online harrassment is a crime. I think it cause wrong feelings: violence, sadness and so on. We should take a safty measure to protect this crime. Online community was made to ask some questions, contact with someone, and get useful information.So we should use it right way.