Which is fine, and good, except when algorithms keyed only to engagement cause the noisiest, most provocative and potentially divisive content to be amplified.

We have, for a very long time, had laws concerning appropriate behaviour in a town square, or any other 'public' setting: don't incite riots, don't behave violently towards others, be respectful if someone doesn't want to talk and walks away. I support the efforts we're now seeing to bring those norms into online spaces.