[informatimago]

1- geolocation must be enabled by the user.

2- you may forward the position of each users to a central server and perform the proximity matches there, and send back the list of close users. That means that IP connectivity is required (GSM or Wifi).

In any case, you get precise geolocation only when you have wifi networks visible, so you may as well require that the user enable wifi.

Once you have wifi enabled, it is possible to use it to scan close users directly, without using geolocation, by mere physical closeness.

You can also do that with bluetooth for closer distances.

So, how you would go about this would depend on what level of privacy and what kind of application you want to do that for.

[markcrazyhorse]

Thanks for the awesome reply. Gonna do some more googling now I know a little more what i'm looking for :)