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 and Wild, Fridolin Case study on social software use in distributed working environments. (2007). , Deliverable 15.2, European Network of Excellence ``Prolearn - Professional E-Learning'' .