It is hard to keep up with the stream of scandals, big and small, involving social networks such as Facebook and Twitter. From unwittingly aiding Russian efforts to subvert elections to finding themselves exploited by extremists and pornographers, they are constantly in trouble.

The latest is YouTube failing to stop videos of children being commented on by paedophiles, while letting advertisements appear alongside them. Only months after Alphabet’s video platform faced an advertiser boycott over extremist videos and had to apologise humbly, companies such as Diageo and Mars are again removing ads.

Each scandal produces fresh calls for networks to be treated like publishers of news, who are responsible for everything that appears under their names. Each one forces them further to tighten their “community standards” and hire more content checkers. By next year, Facebook intends to employ 20,000 people in “community operations”, its censorship division.