On Nov. 20 1983 Scott Boorman, a Yale sociologist, wrote a NYT op ed to show that considerable personal information can be gleaned from just knowing who calls whom. Prof. David Krackhardt at Carnegie Mellon Uni. says that article was ridiculed then. Thirty years later the National Security Agency uses just such a database. Valdis Krebs illustrates the kind of insight that can be gleaned in a very simple example shown here.
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