Is there data to back this up? I'm skeptical. I see all kinds of "small organizations" forming in Slack communities, subreddits, and other online spaces. Some might be described as influencer driven communities like substack. Or audiences of a specific podcast. And so on. It's almost never been easier to participate in one of these "organizations". Even locally, where I live, the school board, city council, local adv…
If you read between the lines of what Terence Tao is saying - which, by the way, the most charitable summary is, "Isn't Dunbar's number interesting?" - he is really saying, "It is hard to make friends as an adult." Extra so if your day to day is something esoteric like academic theoretical math (read between the lines: really boring to most people), and if you are right leaning or libertarian (read between the lines:…
The places that do still have a physical location are often almost grandfathered in where the organisation bought the land decades ago and now pulls in enough from investments to continue perpetually, but could not afford to buy or rent the space at market rate today.