@freemo or anyone: I'm trying to find out how connected the graph of fediverse nodes is. For instance, if it's fully connected (every node connected to every other), that might imply a scalability limit to the number of nodes.
I guess another way of framing the question is whether two nodes A and B are necessarily directly connected because a user in node A follows a user in node B.
So a node with a larger number of users would probably need to connect to correspondingly more other nodes because of the disparate social networks of its users. On the other hand, small nodes with, say, a hundred users who each follow less than a hundred others would only need to connect to at most 10k other nodes, and probably a lot less. (If there were billions of users, I think discovery would become a problem unless there are some nodes with very many users.)
Hi glyn, in case you hadn't found them, I co-maintain some #ActivityPub watchlists:
There's a crowdsourced Guide for AP implementers here:
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