This book covers the relationship between information and communication technologies (ICTs) and communities - both physical and virtual. The chapters deal with such subjects as online social network communities, implicit online communities, tools for researching communities, user generated content communities, communities of practice, and trust in communities. Among the many contexts for community technology applications studied in these chapters are businesses and professional settings, health care, game communities, e-government, rural communities, low income communities and physical neighborhoods. Collectively, they demonstrate the dynamic and interdisciplinary nature of evolving communities and technologies scholarship.