First published in 1955, "Personal Influence" reports the results of a pioneering study conducted in Decatur, Illinois, validating Paul Lazarsfeld's serendipitous discovery that messages from the media may be further mediated by informal "opinion leaders" who intercept, interpret, and diffuse what they see and hear to the personal networks in which they are embedded. This classic volume set the stage for all subsequent studies of the interaction of mass media and interpersonal influence in...