A telegram user found a way to find the location of another user by the use of GPS spoofing and triangulation.
There are 3 methods to do this. One method require some serious hardware. The other one requires an app which you can install. The easiest one will be the physical stalker method, the hacker will just need his mobile phone and just walk around your vicinity.
Here the writer uses the 2nd method.
Do an audit now and check your telegram. See if you have it enabled.
The full article can be found here: https://blog.ahmed.nyc/2021/01/if-you-use-this-feature-on-telegram.html