Nearby lets you know when there are friends nearby! When you see a friend nearby, send them a wave to say hi.
Your Facebook friends are automatically added as Nearby friends, and you will be notified when they are nearby. If you want to know where someone is even when theyre not nearby, add them as a best friend and youll be able to see them when they accept your best friend request.
Nearby uses the most conservative setting to update your location in the background and does not keep GPS running to preserve battery life. Continued use of GPS running in the background can dramatically decrease battery life.