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Online projects are communities of practice which attempt to bypass the hierarchies of everyday life and to create autonomous institutions and forms of organisation. A wealth of theoretical frameworks have been put forward to account for these networked actors' capacity to communicate and self-organise. This article reviews terminology used in Internet research and assesses what it implies for the understanding of regulatory-oriented collective action. In terms of the environment in which interpersonal communication occurs, what differences does it make to speak of “public spheres” or of “public spaces”? In terms of social formations, of “organisations” or “networks”? And in terms of the diffusion of information over the global network, of “contagion” or “trajectories”? Selecting theoretical frames is a momentous decision for researchers, as it authorises or forbids the analysis of different types of behaviour and practices.