I'm glad to see this and he has gone up in my estimations. He was on the campaign trail yesterday and had a lot to say about how the people at Twitter should be accountable.
So it's good that he is principled enough to stop using it in this way.
Caroline Criado-Perez, the woman who campaigned for Jane Austin to appear on bank notes, was subject to horrific abuse on twitter. How I laughed when the two culprits were arrested and sentenced a couple of weeks ago, and when filmed on camera outside were too SCARED to show their faces...