The nodes on our existing social graphs are too large. I'll define a node in this case as a user's potential social graph over time. A naive social network that mitigates this is nextdoor. I say naive because the concept of a "neighborhood" on nextdoor results in a lot of bigotry and noisy neighbor effects. Kind of literally in this case.

But the idea of breaking down large nodes in favor of smaller nodes tied to the community in which a user resides is a decent idea. I speculate we'd see greater efficiency in self-regulation, too. It's not a silver bullet, of course. At least globalization tends to decrease cultural ignorance.

I'd wager global social networks are here to stay, but I think a powerful network could arise that focuses on more refined slices of the social graph.