Cao, Yiwei ; Ehms, Karsten ; Fiedler, Sebastian ; Hofer, Margit ; Kaiamo, Anna-Kaarina ; Kieslinger, Barbara ; Klamma, Ralf ; Krause, Beate ; Kravcik, Milos ; Ryyppö, Tommi ; Spaniol, Marc ; Stumme, Gerd ; Wild, Fridolin: Case study on social software use in distributed working environments, 2007. - Deliverable 15.2, European Network of Excellence ``Prolearn - Professional E-Learning''