How did we get from Hollywood to YouTube? What makes Wikipedia so different from a traditional encyclopedia? Has blogging dismantled journalism as we know it? Our media landscape has undergone a seismic shift as digital technology has fostered the rise of "participatory culture," in which knowledge is originated, created, distributed, and evaluated in radically new ways. The Participatory Cultures Handbook is an indispensable, interdisciplinary guide to this rapidly changing terrain. With short, accessible essays from leading geographers, political scientists, communication theorists, game...