Aeroflotgirl - The important part about trolling is that it is about getting a reaction. The person is saying something outrageous that they may or may not mean to provoke a reaction out of someone. Repeatedly putting unsavory views on the internet can be defamatory (civil matter) and if specific threats are made the police can get involved.
But lets be clear here - the police were not involved, she was not tried or charged of any crime, she was cherry picked from a large pool of people who have views about the McCann's that you may or not agree with. But she was targeted and publicly made an example of.
Now if the Sky News had referred the matter on to the police and she was arrested and convicted of this crime - I'd kind of understand Sky News covering the facts. But the media identifying online users, throwing them into the public spotlight and identifying who they are and where they live is a VERY step into wrong direct - and in my view breach of everyone's right to privacy.