There is no easy answer to this abuse. However abuse it is and in my opinion freedom of speech does not come into it. As I've said before and say again freedom of speech still comes with some responsibility. It is not there just to abuse or threaten as was proved a short while ago when the guy issuing racilist comments went down. Sadly the authorities do not see this kind of abuse as being particularly worthy of prosecution. Banning him from a twitter account would actually effect his use of an E mail address. It could prove to be a bit of a nuisance having to keep changing addresses. Somehow though I cannot see them take any action. So sadly for a short while perhaps he should come off twitter........