How does Facebook know who your friends are?

The social media giant uses a mix of complex science and mathematics to narrow down on your friends list Have you ever thought how Facebook exactly predicts your friends, sometimes even those whom you have long forgotten. Last week, a Redditor named easyjet posted a  on Reddit. He mentioned that he signed up with an email address he never, ever used. He even lied about all of his personal information. Yet Facebook was able to accurately predict and “recommend” a huge number of his real-life acquaintances including a women he had dated 19 years ago.

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