The UK Justice Secretary Chris Grayling has announced plans to increase the maximum prison sentence for online abuse, or trolling, to two years. Laws already exist for dealing with harassment and threats of violence, and the Crown Prosecution Service last year issued clear and strict guidelines on what kind of online speech constituted a crime. Calls for tougher sentencing are unlikely to act as a deterrent to trolls and could have a far more insidious effect — encouraging more arrests and prosecution for free speech that is neither threatening nor harassment, but which simply offends.