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Re:Modifying Telegram's “People Nearby” feature to pinpoint ... by pbhjpbhj on Friday February 05, 2021 @11:16AM (#26037899)
Naively, for democratic countries, I'd imagine you could piggyback off existing political divisions, in the UK that would be electoral wards or shire/city districts. Such divisions should span a reasonable range of people, rather than a geography. In Scotland it would be "council areas".

Though maybe some places have political divisions with only one or two people in that would seem strange?

Re:Modifying Telegram's “People Nearby” feature to pinpoint ... by exporectomy on Friday February 05, 2021 @04:09PM (#26041227)
The service itself will know how many users are where and can make its own boundaries. "Same city" would often be pretty useless for finding people to meet immediately in real life.