There are loads of political shills around on social media, you see them on facebook all the time, the gazette comments section has loads of them, and naturally they will find their way to anywhere regular people post online and the more anonymous they can be the better.
I remember Paul Williams getting slated by some people on his first election campaign, rally laying into some of his historical career decisions, and someone pointed out they all lived in London and went to Eton. Someone else looked them up on LinkedIn and they were interns at the conservative party. So they literally had lackeys in London going around social media pulling away at candidates acting as if they were normal people.
Then you get the activists like SmoggyRainbow. Best thing I ever did was sending the gazette journo's a link to his old post history when he became councillor. Vile person.