Comment by shadowgovt

In social networks, revenue is enhanced by stickiness.

Anger increases stickiness. Once one discovers there are other people on the site, and they are guilty of being wrong on the internet, one is incentivized to correct them. It feels useful because it feels like you're generating content that will help other people.

I suspect the failure of the system that nobody necessarily predicted is that people seem to not only tolerate, but actually like being a little angry online all the time.