Sociologist Duncan Watts asked more than 60,000 senders to forward an e-mail to a first-name acquaintance, who would continued to forward the e-mail through first-name acquaintances until the e-mail reached 18 target recipients in 13 countries.Watts found that the average number of intermediaries before the e-mail reached its intended destination to be

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Duncan Watts' experiment demonstrated the "small-world phenomenon," showing that the average number of intermediaries needed to connect two people is around 6, similar to the concept of "six degrees of separation."

Sociologist Duncan Watts Asked More Than 60,000 Senders to Forward