Frank pointed out some clever research at Microsoft Research. Eric Horvitz and Jure Leskovec parsed through one month of MSN messenger communication, or about 1 billion conversations a day. Among the 240 million users, they discovered an average of 6.6 degrees of separation between any two random users. 6.6 is obviously close to the famed six degrees of separation found in Milgram’s 1967 study. Although, some debate still continues on the validity of that finding. Horvitz made the full paper available, and has really in depth analysis of the spread of MSN Messenger and the communication it facilitates. The image above shows the density of users. The numbers of user shift from high to low according to the light spectrum, with red as high and blue as low (think ROYGBIV.) Since this finding, Horvitz wonders if there is some larger phenomenon at work, with six being some natural average of social interconnectedness. More thoughts to keep me up at night.
