Small World Phenomenon
The six degrees of separation concept originates from Milgram's "small world experiment" in 1967 that tracked chains of acquaintances in the United States. In the experiment, Milgram sent several packages to 160 random people living in Omaha, Nebraska, asking them to forward the package to a friend or acquaintance who they thought would bring the package closer to a set final individual, a stockbroker from Boston, Massachusetts. Each "starter" received instructions to mail a folder via the U.S. Post Office to a recipient, but with some rules. Starters could only mail the folder to someone they actually knew personally on a first-name basis. When doing so, each starter instructed their recipient to mail the folder ahead to one of the latter's first-name acquaintances with the same instructions, with the hope that their acquaintance might by some chance know the target recipient. Given that starters knew only the target recipient's name and address, they had a seemingly impossible task. Milgram monitored the progress of each chain via returned "tracer" postcards, which allowed him to track the progression of each letter. Surprisingly, he found that the very first folder reached the target in just four days and took only two intermediate acquaintances. Overall, Milgram reported that chains varied in length from two to ten intermediate acquaintances, with a median of five intermediate acquaintances (i.e. six degrees of separation) between the original sender and the destination recipient. This concept became popularized by Jon Stewart's Daily Show in the mid-1990s -according to its creators, "a stupid party trick"-called Six Degrees of Kevin Bacon. Milgram's "six degrees" theory has been severely criticized. He did not follow up on many of the sent packages, and as a result, scientists are unconvinced that there are merely "six degrees" of separation. Elizabeth DeVita–Raebu has discussed potential problems with Dr. Milgrams's experiment.
In 2008, a study by Microsoft showed that the average chain of contacts between users of its '.NET Messenger Service' (later called Microsoft Messenger service) was 6.6 people.
Read more about this topic: Stanley Milgram
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