It might seem that Facebook works in mysterious ways when it comes to suggested friends. But there is a set algorithm that Facebook follows to gather the suggestions.
It happens ever so often that you save the contact of a new person on your phone and the next thing you know is that you see that person pop up on your Facebook suggested friends list. Though it might seem like sorcery for a moment, trust me it is not. Facebook has some methods of doing it among others.
Besides this, don’t be surprised if Facebook suggests some long lost friend you hardly even remember. Facebook’s official Help Center page says that ‘People You May Know’ suggestions are assimilated from things like having friends in common, or mutual friends, this is the most common reason for suggestions.
Being in the same Facebook group or being tagged in the same photo. People who use the same networks as you do, for example, your school, university or work. And last but not the least, based on the contacts you’ve uploaded on your phone.
Facebook finds other people on the same network by sending out a data packet containing your information, each time you enter a network. Your phone receives other such data packets as well, and these are used to recognize other people on the same network.
These features not only show that Facebook is very innovative when it comes to data mining and identifying people but scary as well.