How Facebook Figures Out Everyone You've Ever Met
Zach Rose
Info

In real life, in the natural course of conversation, it is not uncommon to talk about a person you may know. You meet someone and say, "I'm from Sarasota," and they say, "Oh, I have a grandparent in Sarasota," and they tell you where they live and their name, and you may or may not recognize them.

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