Once you've completed your profile, you'll have access to a listing of the guys in your city, sorted by proximity. This way, you'll know how far away any given user is, as well as his last connection time. If you want to talk to him, just click on his photo. This will open the chat, where you can enter text and attach photos, videos, or your more precise location. You can also bookmark guys so you can keep track of them even when you're no longer in the same city.
Wapo has some extra paid features, but the free version is more than enough to meet guys, which is probably exactly what you're looking for anyway.