This study explored initial trust formation in a computer-mediated social action network. Little research has been directed towards exploring trust development in this context. This study employed an online focus group and direct observation to examine the risks, interdependencies and trust antecedents that influenced the acceptance of applicants to an online social action network. The risks and interdependencies inherent in the organizations social action projects, combined with the limited identity cues available online, influenced not only the organizations choice of trust antecedents but also where these pre-conditions were found. Although online information provided cues for shared social identity, it was insufficient to extend initial trust to prospective members. Ultimately the decision to trust an applicant was based on real world reputation and third party endorsement by a trusted colleague. Further research is required to examine the impact of information and communication technology on trust formation in contextually diverse online communities.