There's three levels of moderation. The platform needs to insulate itself from attacks: DDOS, illegal content, reputation attacks. The groups/fora/subreddits

There's three levels of moderation. The platform needs to insulate itself from attacks: DDOS, illegal content, reputation attacks. The groups/fora/subreddits need local moderation that keep it on-topic and restrict trolls, flamers, spammers and other bad actors that destroy the utility of the group. (There are occasional groups that exist to be an outlet for off-topic discussion from others, or to out-troll each other, or rant.) Third is individual content control. Everybody needs to have easy access to a killfile: I don't want to see that idiot; I don't want to see any thread that idiot started; I don't want to see any thread that idiot contributed to; I don't want to see an article or thread with these keywords.