Andrew Samwick, Sandra L. and Arthur L. Irving '72a P'10 Professor of Economics and Director, Nelson A. Rockefeller Center for Public Policy and the Social Sciences
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Connected: The Surprising Power of Our Social Networks and How They Shape Our Lives, by Nicholas Christakis and James Fowler, provides a great introduction to the role of networks in human interactions. It is artfully written and draws on many different social science fields for examples. Here's a recent presentation by Christakis on the role of social networks in the spread of obesity.