Couple of my favorites:<p>* https://reddit.com/r/AskHistorians - All things history. Quality of discussions are way better than on most other subreddits. Highly moderated<p>* https://discuss.bootstrapped.fm - bootstrapped businesses<p>* https://lobste.rs - kinda like HN but for tech only<p>* https://slatestarcodex.com - it is more blog than a community, but great nevertheless<p>I used to frequent other communties but these are the ones that stood the test of time
HN mods do a fantastic job with moderating. I don't pretend to know how any of it works, but I consistently enjoy content on the front page of HN, which I can't say about subreddits, even my favorites.<p>Besides HN, a handful of subreddits (r/MachineLearning in particular), and I used to spend a decent amount of time on Product Hunt.<p>I do miss the hell out of forums though. I feel like i "knew" everyone on a better level and could burn through hours talking.
Hacker News and a few Subreddits of whichever hobby I'm interested in at the moment. I do miss the old days of forums, though. HN and Reddit both don't seem to give me the same feeling for some reason I haven't figured out yet.
Many of my friends use Twitter and we regularly comment on and retweet each other's tweets. I've recently been added to a Mastodon group which feels much more tight-knit. I've been playing dota 2 for the past few years and I regularly play with the same group of people. I also have a few discords I've been added to. I tend to lurk on bigger websites like Twitter, Reddit, HN.
Last.fm and Sonemic community are interesting in that they're entirely music based. The discussion revolves entirely around rating and categorizing music which is lovely if you think about it.
HN mostly. The quality of discussion is much higher than reddit. Also, there seems to be less group think here.<p>I have yet to find an online gaming community that I enjoy. I tried different discord servers but it is nothing like good old clan forums back in the day, where you got to know people.
HN mostly. There are a handful of subreddits I check periodically. /r/artificial, /r/AGI/, /r/machinelearning being some of the top ones. Some StackExchange sites, like ai.stackexchange.com, electronics.stackexchange.com, ham.stackexchange.com, and so on.