we can expand the protocol to rank each other in trust scores, so we can filter for: "only show keys/posts who are ranked >x by keys that I rank >y".

this will scale dunbars number to the whole planet.

scoring posts/keys in numbers x/100 is also a way better value metric than just likes/follows.

the hustle of properly ranking other keys is incentivised, because if you are known to give accurate scorings, you get higher scores yourself.