How exactly do you explore the online communities though?
In a lot of cases, I like going through a site's history, reading up on its culture. I've spent a day or two going through the YTMND wiki, for instance, and right now I'm looking through the Let's Play Archive, which has quite a lot of fascinating stuff. My favorite moment there so far is http://lparchive.org/LetsPlay/OregonTrail/Update%2021/index...., an Oregon Trail run where, to decide a single action at a river, people wrote a hundred or so poems stating their opinions.