Understanding one's work environment is important for one's success, especially when working in teams. In virtual collaborative environments this amounts to being aware of the technical and social attributes of one's team members. Focusing on Open Source Software teams, naturally very diverse both socially and technically, we report the results of a user survey that tries to resolve how teamwork and individual attributes are perceived by developers collaborating on GITHUB, and how those perceptions influence their work. Our findings can be used as complementary data to quantitative studies of developers' behavior on GITHUB.