@natecull I'm not sure the name of the phenomenon, but we notice the more extreme ppl more often in these environments. I don't think we anticipated algorithms creating echo chambers. Back in the days of BBSs, phpbb, etc., ppl had to be reasonable. While perceived anonymity makes ppl worse (think of how drivers see cyclists as not human), there being no algorithm along with human moderation made for a better experience.

The #fediverse may be the closest we get to that nowadays.