04/03/2015 11:24 am ET Updated Apr 03, 2015

How Facebook Knows Who All Your Friends Are, Even Better Than You Do

Matt Hamm/Flickr

Last week, a Redditor named easyjet decided to (very belatedly) join the global party that is Facebook. He signed up with an e-mail address he never, ever used. He lied about all of his personal information.

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