ion. The operation of structures and generative mechanisms must be studied as tendencies that may or may not be exercised depending on the concrete situation but which are, nonetheless, real and determining factors. We might say, therefore, that capitalist society contains a general “capitalist” structure but that the various economic structures, relations, and institutions vary in their concre...

We present a dynamical theory of opinion formation that takes explicitly into account the structure of the social network in which individuals are embedded. The theory predicts the evolution of a set of opinions through the social network and establishes the existence of a martingale property, i.e. the expected weighted fraction of the population that holds a given opinion is constant in time. ...

We study the social structure of Facebook “friendship” networks at one hundred American colleges and universities at a single point in time, and we examine the roles of user attributes—gender, class year, major, high school, and residence—at these institutions. We investigate the influence of common attributes at the dyad level in terms of assortativity coefficients and regression models. We th...