I could sort servers on the joinmastodon.org list by proximity to 150 active users (Dunbar's number), I don't know if that would be an improvement. The working set is still 60 top active ones in each category.
For example, sorting the "I am ..." set like that puts writing.exchange, lbgt.io, and monsterpit.net on top, and mastodon.social on the very bottom
On the other hand I do not see a compelling argument for why exactly Dunbar's number (number of personal connections you can maintain in your life) should be used. I don't think most people go into social media expecting to know every single person on their server, and having a headroom of people you don't know might even be a positive thing.
@Gargron Please don’t let chasing a big number for the top server’s user count become a goal. That’s how you end up with a giant pile of uncontrollable users like Twitter. I think the proper response to “the top server is only 200k” is “sure, that means we can pay more attention to keeping things chill; our total user count across every server we know of is (number) and that’s not counting the ones that choose not to be counted.”