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Communications of the ACM


Degrees of Separation

diagram of Facebook users and intermediaries

A study of 721 million Facebook users showed an average of 3.74 intermediaries between a source and target user, as opposed to social psychologist Stanley Milgram's mean of five.

Credit: Dannie-Walker / Wikipedia

Researchers now have the capability to look at the small-world problem from both the traditional algorithmic approach and the new topological approach.

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