The map above is the result of his attempts to visualise where people live relative to their Facebook friends. Each line connects cities with pairs of friends. The brighter the line, the more friends between those cities. After tweaking the graphic and data set it produced a "surprisingly detailed map of the world," he said in a blog post.
"Not only were continents visible, certain international borders were apparent as well," he wrote."What really struck me, though, was knowing that the lines didn't represent coasts or rivers or political borders, but real human relationships.
"However, large chunks of the world are missing, such as China and central Africa, which is the maps strength as it highlights the political influence in those countries/continents as Facebook, as too Google, have struggled to function there with rules and as so have a small presence.