The Web 2.0 ideas and technologies provide completely new possibilities in the area of collaboration. The collaboration of project teams or networks is in most cases one of the first and most concrete use cases of social business software. How can social business platforms best support the different kinds of social groups and their particular way of collaboration? Which other framework conditions have to be given? In this whitepaper we want to address these questions. The single chapters are not built upon one another but examine different perspectives of this issue. They are complementary and correlate.