How to find out if a friend lives near you
Quick answer
To know if a friend lives near you, save their home to a private list and let your phone measure the distance, alerting you whenever you pass close to where they live.
You can just ask, of course, but addresses are easy to forget and awkward to act on later. A cleaner method is to save where each friend lives to a private list, then let your phone do the math. As you go about your week, it measures the gap to those saved homes. When you are close to one, it tells you. You learn who lives near you through real proximity, not a static address book.
In one sentence
Parages pings you when you pass near a friend. It tracks nobody.