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The diploma thesis Public sphere in networked society concerns about the relation of public sphere and cyberspace. Cyberspace is defined as new social institution, which is not embodied Habermasian normative ideal of critical public sphere, but in contrary it constitute new forms of inequalities and new forms of fragmentarization and commercialization. Explored are therefore also theories which critically deal with concept of public sphere and better describe the reality of cyberspace. The expansion of Cyberspace and horizontal communication network also relate with transformation of contentious politics. The thesis provides an overview of historical development of new action repertoire of contention - virtual sit-in. As an embodiment of all these societal shifts, which are seen as an elements of change in power balance, is presented Operation Payback orchestrated by hacktivist group Anonymous. Keywords Cyberspace, public sphere, hacktivism, action repertoires, repertoires of contention, virtual sit-in, electronic civil disobedience, Anonymous, Operation Payback