I never use Find My Friends on my iPhone for two reasons. First, not all of my friends are on iOS. Second, it sounds kind of creepy. According to reports, Facebook is working on a smartphone app that would help you find nearby friends and even run in the background. That means when you turn on your handset, you’ll automatically know where your closest friends are — assuming they opt in and want to be found.
The challenge for Facebook is to make users want to broadcast their location at all times, which could be accomplished via location-based offers and finding places of interest while you’re on the go. I could easily see Facebook Messenger (unobtrusively) suggesting things to do during a messaging session between two friends that Facebook knows are in the same city.