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Re:Modifying Telegram's “People Nearby” feature to pinpoint ... by petre on Friday February 05, 2021 @11:50AM (#26038305)
It can be easier. One could geohash the location with a certain precision, say 5 = ±2.4 km and only display people in that geohash and the neigbouring geohashes.

https://en.m.wikipedia.org/wiki/Geohash

Re:Modifying Telegram's “People Nearby” feature to pinpoint ... by ericpauley on Friday February 05, 2021 @12:09PM (#26038537)
The functional component of this technique is still just quantization (as in the parent). One might argue that this is actually more complicated.