Extended call for proposals Materializing Activism: A workshop at ECSCW 2019, June 9 in Salzburg, Austria. Net activism shows how easily available tools allow the organization of social movements to be scaled up and extended globally. These media ecologies enable new forms of power. This one-day workshop gathers researchers focusing on the collaborative efforts within social movements, looking into the socio-technical systems; the organization of activism; the relations between traditional and social media; and the complex network of systems, information, people, values, theories, histories, ideologies and aesthetics underlying various types of activism. The workshop consists of presentations and brainstorming sessions where we materialize the intangible and develop our theories and ideas further through a collaborative design process. Deadline for submissions is April 15, 2019. The maximum length of a paper is 2,000 words. The papers should follow the ECSCW formatting guidelines. Submissions and inquiries shall be sent to the following email address: khansson@dsv.su.se<mailto:khansson@dsv.su.se> For more information about the workshop and suggested topics visit the web page: https://materializingactivism.blogs.dsv.su.se<https://materializingactivism.blogs.dsv.su.se/>