Why does the same person with no mutual friends or connections always rank high (or on top) every single day in the "People You May Know" list on Facebook? How does the ranking work?
Facebook – How does the ranking of “People You May Know” work
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Best Answer
Only Facebook knows for sure. I'm sure their algorithm is just one of many trade secrets.
They do say in Facebook Help:
Since you say there are no mutual friends between you, perhaps they went to the same school as you, or worked in the same company, or live in the same town. Maybe you and a bunch of your friends happen to have them in your contacts.
Facebook bought a company called Octazen back in 2010, whose specialty was scraping user data. There could be any of a number of connections between you that you don't realize (according to Facebook) and everyone else who would "rank higher" is probably already your friend (or you've blocked and won't show in the list anyway).
But, really, without a Facebook engineer who knows the algorithm to tell us, we can only guess.