Three degrees of separation: The mathematics of (real) social networks

Social networks are governed by some unexpected factors, including the genes of people you’ve never met, says Yale University’s Professor Nicholas Christakis, whose research has explored three different types of “social contagion”.

In a little over ten years, Facebook has become a global phenomenon, connecting people digitally all over the world and generating huge amounts of money for its founder. But there’s more to social networks than digital algorithms – they g

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