Read more about the book John Cacioppo, a psychologist at the University of Chicago who has written a book called "Loneliness,"( teamed) up with Christakis and Fowler to study the effect of this phenomenon in social (networks). The authors focused on (data ) from the Framingham Heart Study, which has followed thousands of people in Framingham, Massachusetts, since 1948. The loneliness research looked at the second generation in the study, which includes (5,124) people. In the heart study, researchers (kept in touch) with participants every two to four years, asking them about (depression), loneliness and other issues. They also kept a record of their friends. This allowed Christakis, Fowler and Cacioppo to look at the subjects' social networks over time. If a direct connection in your social network is lonely, you are 52 percent more (likely) to be lonely, the researchers found. At two degrees of separation -- a friend of a friend -- it's 25 percent. At three (degrees), someone who knows your friend's friend, it's 15 percent.
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