A #WebRing should be a thing. To make the ring a thing, a collection of people (or #Fedi instances) could run some one-liner that does a worse-is-better style synchronization with regard to what defines the ring. That way you know what thing the ring is.
These ring things should be at-a-glance simple, delete themselves on abuse, and super easily reinstantiate with most of the same members.
I think this could be the beginning of a truly #polycentric architecture.