Is Trolling a Crime, and thus a Defamatory epithet?

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"The Internet has developed a rather unfortunate infection, which is called Trolls. Trolls are unpleasant Internet vigilantes who target anyone who they feel doesn’t fit in with their own personal views on the world, and woe betide you if you actually directly challenge those views.

Trolling is a new term for an old, and very antisocial form of behaviour called harassment, and in civilised societies we have laws preventing one individual from harassing another, or from organising a group to do so.

This is where the Internet steps in and messes things up somewhat. Not only does the net give people anonymity for good reasons, such as hiding from persecution, but it also allows people to hide their identities whilst they cause trouble for others."