Health Related Virtual Communities and Social Networking Services -- Emergent Evaluation Criteria for Collaborative Learning Environment -- Evaluating and Enriching Online Knowledge Exchange: A Social Epistemological / Lay Epistemics Perspective -- Organizational Design of Online Communities -- A Security Model for Virtual Healthcare Communities -- Cybernationalism: Terrorism, Political Activism, and National Identity Creation in Virtual Communities and Social Media -- E-Government and Data Protection in the Public Sector -- Building SCIENAR, A Virtual Community of Artists and Scientists: Usability Testing for the System Improvement -- User-Generated Content for Location-Based Services: A Review -- Generating Social Awareness through Social Network Sites -- Markov Random Field and Social Networks -- Mobile Communities – Current Status and Challenges -- Social Networks in Environmental Epidemiology.

Chapter 1. Health Related Virtual Communities and Social Networking Services Stamatia Ilioudi, Athina Lazakidou, Nick Glezakos, and Maria Tsironi Chapter 2. Emergent Evaluation Criteria for Collaborative Learning Environment Ibrahiem M. M. El Emary Chapter 3. Evaluating and Enriching Online Knowledge Exchange: A Social Epistemological / Lay Epistemics Perspective Paul Matthews and Judith Simon Chapter 4. Organizational Design of Online Communities Nick Glezakos and Athina Lazakidou Chapter 5. A Security Model for Virtual Healthcare Communities Anargyros Chryssanthou, Iraklis Varlamis, and Charikleia Latsiou Chapter 6. Cybernationalism: Terrorism, Political Activism, and National Identity Creation in Virtual Communities and Social Media Matthew Franklin Palmer Chapter 7. E-Government and Data Protection in the Public Sector Mary Lampri Chapter 8. Building SCIENAR, a virtual community of artists and scientists: usability testing for the system improvement Iole Alfano, Manuela Carini, and Lorella Gabriele Chapter 9. User-Generated Content for Location-Based Services: A Review Lee Fueng Yap, Masahiro Bessho, Noboru Koshizuka and Ken Sakamura Chapter 10. Generating Social Awareness through Social Network Sites Penelopi Alexandrou Chapter 11. Markov Random Field and Social Networks Stelios Zimeras Chapter 12. Mobile Communities – Current Status and Challenges Volkmar Schau , Kathrin Kirchner , Christian Stolcis, Christian Erfurth, Gerald Eichler, and Wilhelm R. Rossak Chapter 13. Social Networks in Environmental Epidemiology Stelios Zimeras and S. Geronikolou