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[fetokun]

Very nice to know this!
Do you know how do they keep track of this?

Bitcoin is designed such that every node has a database filled with the IP addresses of nearly every other node. The map was created by collecting these stored IP addresses from nodes and then geolocating them.

So the map doesn't consider the people who use bitcoin through sites like mybitcoin.com ?

[theymos]

So the map doesn't consider the people who use bitcoin through sites like mybitcoin.com ?

Right. People who use Bitcoin through Tor are also not included, I believe.