The UGC (User Generated Content) revolution of Web 2.0 brought the application of this new paradigm into the enterprise and professional environment. This phenomenon is called Enterprise 2.0 and in these last years has drawn the attention of many experts in the fields of organization and knowledge management. In this context, Wiki systems and other social networking applications represent an important shift on the way in which people work: at the opposite of other previous IT technologies in this field, the Enterprise 2.0 is not about simple devices of office automation, but requires (and...