Sociology's marginality to public discussion of the current economic, social and political crisis stems partly from naivete about the sociology of its own knowledge, in particular about its interlocutors' interests. Historically, sociology has repeatedly re-established its intellectual relevance through dialogue with movements for social change; this article argues that another such dialogue is overdue. Starting from existing discussions of social movements and their knowledge production, the article focuses on the organisational dimension of such knowledge and explores how this is elaborated in the current movement wave. Looking at movement spaces of theoretical analysis, new popular education processes and movements' knowledge creation institutions, the article highlights potential contributions to renewing sociological processes of theorising, teaching and engaged research respectively, paying particular attention to movement practices of talking between worlds'. It concludes with a call for a dialogue of critical solidarity between public sociology and new forms of social knowledge production.