The members of every community can be thought of as linked by a network of one-to-one ties between people who are related to one another as friends, neighbors, relatives, or coworkers. The distance between any two people is the minimum number of steps through ties in the network needed to go from one to the other. A common and unusual characteristic of communities is that these distances are no...

Communities with high levels of social capital are likely to have a higher quality of life than communities with low social capital (Coleman, 1988, 1990; Putnam, 1993, 2000). This is due to the greater ability of such communities to organize and mobilize effectively for collective action because they have high levels of social trust, social networks, and well-established norms of mutuality (the...

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Social networks are important for finding jobs, but which ties are most useful? Granovetter (1973) suggested that “weak ties” are more valuable than “strong ties,” since strong ties have redundant information, while weak ties have new information. Using six million Facebook users’ data we find evidence for the opposite. We proxy for job help by identifying people who eventually work with a pre-...

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We explore the conflict between personalization and privacy that arises from the existence of weak ties. A weak tie is an unexpected connection that provides serendipitous recommendations. However, information about weak ties could be used in conjunction with other sources of data to uncover identities and reveal other personal information. In this article, we use a graph-theoretic model to stu...

Goldenberg, Libai & Muller (2001) achieved two outcomes: empirical support for a fundamental theory of communications, known as the “strength of weak ties” (Granovetter 1973), and an explication of small-worlds simulations in marketing. Where Goldenberg et al found that weak-ties had as much or more effect on information dissemination than did strong ties, a near-exact replication, reported in ...