"Radio from its beginning has been a revolutionary technology adaptable both to violent overthrow of corrupt regimes and gradual almost unheeded social change. This issue of WPCC invited submission of papers on the subject of radio and revolution. We suggested that revolution be intended in its broadest sense, encompassing not only the violent overthrow of governments and their counter measures but also revolution in the sense of radical social change. Radio’s long set of histories and traditions of activism and community-building are foremost in this issue’s material. This editorial reflects on key themes of the journal issue: motivations of free radio practitioners, key phases in development of community broadcasting, radio’s potential for social liberation of several kinds and its claims to be a form of mass self-communication in which users also take charge of the media platform itself and lastly radio’s presence alongside social media like Twitter in contemporary activism and protests." (Editorial abstract)