BBC local radio presenter Alex Belfield, 42, was jailed for five years and 26 weeks last Friday after being found guilty of waging a campaign against a number of figures from the broadcasting world. Jurors accepted he caused serious alarm or distress to two victims and found him guilty of "simple" stalking in relation to Channel 5 and BBC Radio 2 presenter Jeremy Vine and theatre blogger Philip Dehany.Addressing social media companies' response, Mr Vine told BBC Two's Newsnight: “I am amazed at how hard it is to get them to realise.So we went to YouTube and said: ‘Come on, what is going on with his guy? You can’t allow him to just defame’.“And then we said: ‘OK, there is a libel action now based on that video, that video, that video’ – they still won’t take them down.“Eventually I have to go through a lawyer, they take down individual videos, and then when he is convicted they demonetise him.