Using the open source statistical tool R, Butler has taken data from a sample of aboutu 10 million friendship pairs, plotted them to location, and counted the number of friends between pairs of cities.
Here's part of Butler's explanation:
"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."
Butler says that when he shared the image with others at Facebook, "it resonated with many people. It's not just a pretty picture, it's a reaffirmation of the impact we have in connecting people, even across oceans and borders." Indeed, it is a very powerful visualization of our world.
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