Using sexual contact as an example: when one has contact with another person, contact is effectively made with every person that person has come into contact with, and every person those people have come into contact with and so on.
The idea that any two people on Facebook can be connected through no more than 4 mutual friendships.
The average person has 130 friends on Facebook, meaning that they have on average 130² friends of friends, 130³ friends of friends of friends, and so on. In six degrees that encompasses 130^5 people. This is 3.7 billion people, more than the entire global Facebook community.
Jane is friends with Mark
who is friends with Karisa who is friends with Oleshia
who is friends with Chenwei who is friends with 손재호
