This chapter conceptualises how grassroots food activists navigate two points of tension in their practice: tensions associated with these groups’ anti-capitalist aims and the commercial media platforms they use, and tensions that arise when non-hierarchical aspirations are perceived as clashing with moral imperatives such as veganism. By exploring how activists negotiate these tensions, the paper develops a new conception of how agency is negotiated with and against the constraints of contemporary communication ecologies. In the process the paper enriches existing theoretical understandings of communication ecologies, by drawing this body of work into dialogue with insights from feminist STS.