Do you know who all of your friends are—even your "future friends?" Well, Facebook does and it probably knows them better than you do, since you haven't met some of your friends yet. "Once Facebook knows the structure of your social network, it can analyze it to predict (with startling accuracy!) not only the people you're most likely to know now, but the people you're most likely to know in the future."

Caitlin Dewey writes, "In the end, Facebook's friend-recommendation system isn't magic or malice—just really good math. And guessing your future friends isn't telling the future; it's modeling the evolution of Facebook's social graph." So, this all boils down to picking who you "friend" carefully in the "People You May Know" section of Facebook.

Source:

Caitlin Dewey, “How Facebook knows who all your friends are, even better than you do,” The Washington Post (4-2-15)