Theguardian has an article from 2009 that claims that everyone on earth is seperated by at most 6.6 degrees of separation. It suggests that conclusive research from microsoft using data from 30 billion conversations confirms the "7 layers of isolation" theory. Today the number might be even lower. Some secluded indivuals might be exceptionally isolated, but for the majority of people, this rule holds true. Check out the article for yourself: https://www.theguardian.com/technology/2008/aug/03/internet.email.
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