I suppose there could be communities focused away from conversations. Like an auditorium you rent for your class of 200 to watch a movie that isn’t in print anymore and then discuss it afterwards. I imagine someone would stand up in said auditorium when they have a well formed idea or rebuttal to an idea, but refrain from standing just to add some conversational space filler like “I agree” and then sitting back down (which is kind of comical now that I think about it). Port over this idea into the internet and you get the communities you’re talking about, correct?