This book offers an introduction to communication theory that is appropriate to our post-broadcast, interactive media environment. The author contrasts the ′first media age′ of broadcast with the ′second media age′ of interactivity. Communication Theory argues that the different kinds of communication dynamics found in cyberspace demand a reassessment of the methodologies used to explore media, as well as new understandings of the concepts of interaction and community (virtual communities and broadcast communities).