This article brings a preliminary study that has been carried on by its authors in the last months. We describe collaborative practices in activist networks, such as Rio na Rua's Facebook page and "Avaaz". The main focus here is to present the methodological phase of the research to support our thesis: collaborative networks, whether political or not, mobilize non-paid work of billions of people who contribute to capital accumulation. The Political Economy of Information, Communication and Culture is the theoretical basis of the analisys and we publish here some preliminary results of ongoing empirical research.