If you said OK to your mobile Facebook app to follow your location by activating “Nearby Friends” feature then you may get this.
Yesterday, I met a person whom I’ve never seen in my life before. I had dinner with that person along with other friends and family members. That person Android phone and my iPhone came close together for about two hours. Then I returned home and opened my Facebook app. Guess what the first person suggested to be added as a friend was the person I just met! We have only one mutual friend on Facebook.
Facebook is now following your location and can suggest friends as they come closer to you in location. Amazing!