(SLATE) – Facebook founder Mark Zuckerberg has said that his goal is to make the world more transparent.

And in many ways, Facebook has done that. It lets you keep tabs on your friends, acquaintances, crushes, kids, etc., by telling you what they’re reading, what games they’re playing, and even, at times what they’re thinking, no matter where in the world they are.

But for all the barriers it breaks down between you and your far-flung friends, Facebook has never told you anything about the stranger who’s sitting right next to you. That may be about to change.

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