Six degrees of separation (also referred to as the "Human Web") refers to the idea that, if a person is one step away from each person they know and two steps away from each person who is known by one of the people they know, then everyone is no more than six "steps" away from each person on Earth. The easier way to understand this is that person A only needs a maximum of five people in between to connect to person B (Supposing person A and B don't know each other.)
Here's a pretty easy to read diagram:
This shows that out of all the people that person A and B knows, there's at least one chain linking the two through a chain of friends, friends' friends, and so on.
Do you think that this theory is true and everybody on the planet is connected through a strange chain, or do you think some guy had way too much time on his hands one day?.
