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I was reading about Kademlia and got to wondering what other distance metrics people had implemented other than xor. Turns out there's geographic routing[0], social routing, and all sorts of fun stuff. Very interesting field.

I also was amused to see what they considered social networks in 2004.

[0]: https://www.researchgate.net/publication/231183253_GeoKad_A_...

I literally did my PhD on this topic. You can make any distance metric with a triangle inequality work.

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