The article you posted Growstuff was an amazing and coherent description of how the far right, conspiracy theorists, and the disaffected, came together in the riots, and how it built up.
The far right now have tools to spread their ideas in Social Media in ways they previously had no access to. It's also a sobering reminder what part Farage played with his stunts - and what he said.
As Growstuff said above, "Unlike in China or some other countries, we in the UK do have the freedom to state our opinions.
The line is drawn when that opinion becomes incitement to do actual harm to other people and a great deal of that is clearly going on. I dont know whether prison will deter, but its certainly time - as I'm sure they are - to monitor these networks and act within the law against them.