The feature is based on locating and discovering friends who are nearby or on the go.
According to Facebook, after turning on the feature, you will get, occasionally, notification when your friends are nearby, so that you can have a meet up with them if you wish.
“For example, when you’re headed to the movies, Nearby Friends will let you know if friends are nearby so you can see the movie together or meet up afterward,” it further said.
Facebook has also tested this feature in 2012, but rolled back it after some days. Some critics say that the feature could become a tool for criminals to locate ‘prospect’ victims using Facebook.
A thing to remeber to use this feature, available for Android and iOS users in US soon, is that you and your friend, to whom you want get connected, both have to turn on the feature.
Another good use of the feature is to find your friends on traveling, in case these friends have this feature on.