The Tipping Point: How Little Things Can - By Gladwell, Malcolm Page 0,12

Milgram calls Mr. Jacobs. The balance of letters came to the stockbroker at his office, and of those the majority came through two other men, whom Milgram calls Mr. Brown and Mr. Jones. In all, half of the responses that came back to the stockbroker were delivered to him by these same three people. Think of it. Dozens of people, chosen at random from a large Midwestern city, send out letters independently. Some go through college acquaintances. Some send their letters to relatives. Some send them to old workmates. Everyone has a different strategy. Yet in the end, when all of those separate and idiosyncratic chains were completed, half of those letters ended up in the hands of Jacobs, Jones, and Brown. Six degrees of separation doesn’t mean that everyone is linked to everyone else in just six steps. It means that a very small number of people are linked to everyone else in a few steps, and the rest of us are linked to the world through those special few.

There is an easy way to explore this idea. Suppose that you made a list of the forty people whom you would call your circle of friends (not including family and co workers) and in each case worked backward until you could identify the person who is ultimately responsible for setting in motion the series of connections that led to that friendship. My oldest friend, Bruce, for example, I met in first grade, so I’m the responsible party. That’s easy. I met my friend Nigel because he lived down the hall in college from my friend Tom, whom I met because in freshman year he invited me to play touch football. Tom is responsible for Nigel. Once you’ve made all of the connections, the strange thing is that you will find the same names coming up again and again. I have a friend named Amy, whom I met when her friend Katie brought her to a restaurant where I was having dinner one night. I know Katie because she is the best friend of my friend Larissa, whom I know because I was told to look her up by a mutual friend of both of ours—Mike A.—whom I know because he went to school with another friend of mine—Mike H.—who used to work at a political weekly with my friend Jacob. No Jacob, no Amy. Similarly, I met my friend Sarah S. at my birthday party a year ago, because she was there with a writer named David who was there at the invitation of his agent, Tina, whom I met through my friend Leslie, whom I know because her sister, Nina, is a friend of my friend Ann’s, whom I met through my old roommate Maura, who was my roommate because she worked with a writer named Sarah L., who was a college friend of my friend Jacob’s. No Jacob, no Sarah S. In fact, when I go down my list of forty friends, thirty of them, in one way or another, lead back to Jacob. My social circle is, in reality, not a circle. It is a pyramid. And at the top of the pyramid is a single person—Jacob—who is responsible for an overwhelming majority of the relationships that constitute my life. Not only is my social circle not a circle, but it’s not “mine” either. It belongs to Jacob. It’s more like a club that he invited me to join. These people who link us up with the world, who bridge Omaha and Sharon, who introduce us to our social circles—these people on whom we rely more heavily than we realize—are Connectors, people with a special gift for bringing the world together.

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What makes someone a Connector? The first—and most obvious—criterion is that Connectors know lots of people. They are the kinds of people who know everyone. All of us know someone like this. But I don’t think that we spend a lot of time thinking about the importance of these kinds of people. I’m not even sure that most of us really believe that the kind of person who knows everyone really knows everyone. But they do. There is a simple way to show this. In the paragraph below is a list of around 250 surnames, all taken at random from the Manhattan phone book. Go down the list and give yourself a point every time you see a surname that is shared by someone you know. (The definition of “know” here is very broad. For example,