An academic myth underlies the belief that everyone in the world is connected by " six degrees of separation." The idea spread after a 1967 article in which Yale psychologist Stanley Milgram had Americans send letters to strangers using only friends as intermediaries; on average it took five friends ( six degrees ) for letters to arrive. But when Judith Kleinfield of the University of Alaska Fairbanks revisited the study, she found only about of 30% of letters arrived. One result stands up : A few well connected individuals can act as gatekeepers, passing data to the wider world.
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