In this paper, we explore the role of mischief as borderline socially acceptable behaviour within social computing applications. Mischievous activity pushes the boundaries of the implicit social contract present in all online social systems, and, we argue, is of vital importance understanding online social interactions. Using examples from games and other applications, we explore mischief as an act of appropriation, which reinterprets mechanics defined by developers in unexpected and sometimes upsetting ways. Although frequently interpreted as negative and anti-social behaviour, we argue that mischief serves a vital social role, and find surprising richness in the chaos
