This chapter analyses the Spanish social movement of the 15M, and the influence of Information and Communication Technologies on it. Drawing a distinction between liberal and republican citizenship, the first part of the chapter discusses the interactions between technology and social movements in terms of political participation. This part compares and contrasts characteristics of online-based interactions with offline mobilisations in Spain. The second part of the chapter compiles a set of features that can be found in current Internetworked Social Movements, and its meaning from the perspective of political engagement. The chapter concludes that ICTs contributed to the recuperation of republican politics with current examples that suggest that forthcoming movements will promote this kind of participation.