Startup with geolocation by interests

Question

Startups

Good day everyone! Can you tell me if there are already implementations of this idea: a person wants, for example, to go rollerblading, hangs up an appropriate message that is tied to the map. It seems to me that something like this already exists, but I can’t remember a specific example.

Answer 1

This comes to mind www.sports-tracker.com/

Answer 2

I have not seen analogs. Almost Foursquare, but different. Great idea, it would be a good startup :)

Answer 3

A little bit similar to mirtesen.ru
Although as a separate project it would be interesting in any case

Answer 4

katkin.ru