In one sentence, describe what the following article is about:

It's the blue icon with a white "f" on your home screen. If you see the login screen, enter your Facebook username and password, then tap Log In. It's at the bottom-right corner of the screen. It has a pink icon with several circles inside. This will display a list of your nearest friends and their current locations. If you don't see a friend you know is nearby, they may not have Location Services enabled.

Summary:
Open Facebook. Tap . Scroll down and tap Nearby Friends.