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...

Econometricians are increasingly working with high-dimensional networks and their dynamics. Econometricians, however, are often confronted with unforeseen changes in network dynamics. In this paper, we develop a method and the corresponding algorithm for monitoring changes in dynamic networks....