  The phrase "online harms" has emerged in recent years out of a growing
political willingness to address the ethical and social issues associated with
the use of the Internet and digital technology at large. The broad landscape
that surrounds online harms gathers a multitude of disciplinary, sectoral and
organizational efforts while raising myriad challenges and opportunities for
the crossing entrenched boundaries. In this paper we draw lessons from a
journey of co-creating a transdisciplinary knowledge infrastructure within a
large research initiative animated by the online harms agenda. We begin with a
reflection of the implications of mapping, taxonomizing and constructing
knowledge infrastructures and a brief review of how online harm and adjacent
themes have been theorized and classified in the literature to date. Grounded
on our own experience of co-creating a map of online harms, we then argue that
the map -- and the process of mapping -- perform three mutually constitutive
functions, acting simultaneously as method, medium and provocation. We draw
lessons from how an open-ended approach to mapping, despite not guaranteeing
consensus, can foster productive debate and collaboration in ethically and
politically fraught areas of research. We end with a call for CSCW research to
surface and engage with the multiple temporalities, social lives and political
sensibilities of knowledge infrastructures.
