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Facebook engineering intern Paul Butler has created the stunning map of international human relationships above, using a ten million friend pair sample size from Facebook social graph data. The result is stunning. From an optical point of view. But also what it’s distribution is concerned.

Paul Butler: I defined weights for each pair of cities as a function of the Euclidean distance between them and the number of friends between them. Then I plotted lines between the pairs by weight, so that pairs of cities with the most friendships between them were drawn on top of the others. I used a color ramp from black to blue to white, with each line’s color depending on its weight. I also transformed some of the lines to wrap around the image, rather than spanning more than halfway around the world.”

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