Can any one say how facebooks nearby friends feature works?

Question

Explain how real time location based users data was displayed as in case of facebooks nearby friend feature and how ubers locate it nearby drivers

Answer 1

Your cellphone constantly tracks your location via the builtin GPS device and the proximity of nearby wifi signals. Whether you like it or not, you are under surveillance ;)
Facebook, Uber and other mobile apps are able to access this data because you authorized them, when you installed their app. You can be sure that they store and analyse this information they collect from millions of users, with Big Data techniques, that's how they can determine where your friends are. This may be a convenience feature in some cases but you can rest assured Facebook and Google gets plenty of advantage from it, by swarming you with personalized advertisements that create revenue for them.

Answer 2

Thnks tibor sanstha..
I know that google collects our data
Iam trying to develop an application that displays other users location /information in an user app interface..
Just as tinder displays nearby users information with location age, matches as so something like that
Can you suggest any ways with your experience of developing stuff like that

Answer 3

If you can convince your users to share their location data with you (practically allow you to spy on them...) , then it should be possible, but I haven't built anything like this before.
You would need to write a web service that receives the geolocation data from your users device, for example via REST API, and store it in a database. And you need some kind of app (this can be a web application they access from browser, or a native mobile app) that sends the data from the user, probably automatically at specific time intervals. Probably the same app can display the data collected from the rest of the users.