Of course, movements can’t stay bubbles if they want to win.

Fortunately, social media gave Corbyn’s supporters a powerful weapon. Banished from the public sphere, they built one of their own. They didn’t merely use social media – judging by the number of tweets and Facebook engagements, they dominated it. Pro-Labour memes, slogans, videos and articles saturated online networks. Some were funny, such as a viral video of Corbyn extemporaneously eating a Pringle.