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Six degrees of separation (also referred to as the “Human Web”) refers to the idea that everyone is on average approximately six steps away from any other person on Earth, so that a chain of, “a friend of a friend” statements can be made, on average, to connect any two people in six steps or fewer.
Networks spread wide but are locally clustered and centre around the strength of ‘hubs’ which have a lot of connections. The network can survive if parts of it are destroyed but not if the hubs are destroyed.
For an example. Take one person who you have never met and try to connect to them through 6 degrees of separation.