The Internet has multiplied the platforms available to influence public opinion and policy making. It has also provided citizens with a greater capacity for coordination and mobilisation, which can strengthen their voice and representation in the policy agenda. As waves of protest sweep both authoritarian regimes and liberal democracies, this rapidly developing field calls for more detailed enquiry. However, research exploring the relationship between online mobilisation and policy change is still limited. This special issue of ‘Policy and Internet’ addresses this gap through a variety of perspectives. Contributions to this issue view the Internet both as a tool that allows citizens to influence policy making, and as an object of new policies and regulations, such as data retention, privacy, and copyright laws, around which citizens are mobilising. Together, these articles offer a comprehensive empirical account of the interface between online collective action and policy making. Within this framework, the first article in this issue, “Networked Collective Action and the Institutionalized Policy Debate: Bringing Cyberactivism to the Policy Arena?” by Stefania Milan and Arne Hintz (2013), looks at the Internet as both a tool of collective action and an object of policy. The authors provide a comprehensive overview of how computer-mediated communication creates not only new forms of organisational structure for collective action, but also new contentious policy fields. By focusing on what the authors define as ‘techie activists,’ Milan and Hintz explore how new grassroots actors participate in policy debates around the governance of the Internet at different levels. This article provides empirical evidence to what Kriesi et al. (1995) defines as “windows of opportunities” for collective action to contribute to the policy debate around this new space of contentious politics. Milan and Hintz demonstrate how this has happened from the first World Summit of Information Society (WSIS) in 2003 to more recent debates about Internet regulation. Yana Breindl and François Briatte’s (2013) article “Digital Protest Skills and Online Activism Against…