I keep seeing hints of these communities existing, here in hn comments. Every time a thread is about communities that are still good, still human etc someone pops up saying these communities exist, but no-one ever mentions what these communities are.

I mean, I get it: one risks eternal-september-ing them as soon as the hn crowd finds out about them, but sometimes it's really frustrating going down a thread hoping to find better indications for these mythical great communities and always coming back empty-handed.