I'm still a FB user even though most friends and relatives have disengaged due to toxicity. But what I've noticed consistently is that any group on FB that has more than 1000 members will end up surfacing so much toxic sentiment that I have to unsubstantiated. I'm talking about innocuous fields such as the local road conditions. That one became full of rants about out of state drivers, drivers who don't understand English, people posting license plates of bad drivers, etc. This has led me to a theory that humans just can't behave nicely beyond some threshold group size.