A number of nonprofits and social innovators are already using online communities to effect change. A key resource for decision makers and practitioners, this book highlights the very best of these efforts and examines the impact of online communities on important causes related to the environment, health care, education, politics, and social change. Chapters feature the work of individuals and organizations leading in this area, bringing together their success stories and analyzing how they are using online communities to enhance their Web presences, build communications strategies, connect with volunteers, and raise funds.