This is part of what I love about Mastodon: if you PM someone, very often you're talking between two random servers and odds are good that the admin is a friend

This is part of what I love about Mastodon: if you PM someone, very often you're talking between two random servers and odds are good that the admin is a friend of a friend. No dragnet statistical analysis stuff, just friends running some software that normal people can also use. Distributed systems at their best