The hugely popular link-sharing site is in a state of virtual lockdown after the volunteers who run some of the site’s biggest communities (known as “subreddits”) went on the digital equivalent of a general strike. This followed the sacking of Victoria Taylor, a popular site admin, after a Reddit Q&A with the Rev. Jesse Jackson went badly for the activist preacher. High-traffic subreddits dedicated to movies, gaming, videos, history, science and art have been voluntarily locked by their moderators as an act of protest against the decision, which they saw as a symptom of an increasingly overbearing management that takes...