“Against that background, the CPS has the task of balancing the fundamental right of free speech and the need to prosecute serious wrongdoing on a case by case basis. That often involves very difficult judgment calls and, in the largely unchartered territory of social media, the CPS is proceeding on a case by case basis. In some cases it is clear that a criminal prosecution is the appropriate response to conduct which is complained about, for example where there is a sustained campaign of harassment of an individual, where court orders are flouted or where grossly offensive or threatening remarks are made and maintained. But in many other cases a criminal prosecution will not be the appropriate response. If the fundamental right to free speech is to be respected, the threshold for criminal prosecution has to be a high one and a prosecution has to be required in the public interest.