I remember the old days of Flickr. The copywriting on that site was spectacular and full of personality. Slack has some of it, but Slack is not as fun as Flickr was.
when you enter some community event (bingo, concerts, golf) the social atmosphere does a good job self regulating. there are expected standards for behavior. the internet is a different beast of course, but i wonder if we still can't do a better job encouraging people do be/do good.