This chapter focuses on the role of media as a driving force of social change is one of the main characteristics of the concept of mediatization. Looking at the changes in political participation from the perspective of mediatization as a dynamic process offers an approach to the media as a driving force of these changes, which are currently being experienced around the globe. The mediatization of politics it is evident that social relations online play an increasingly important role. People meet on the web, organize activities and exchange information, whether on Facebook, Twitter, Instagram or in blogs. Social interaction and group formation in particular must consequently be revisited in light of social networking sites (SNS). The concept of the public sphere has been applied and linked to many issues and approaches in media and communication theory. The approach developed in this paper leads to argue that the notion of fragmentation does not reflect the role of the net-based publics properly.