The growing dissatisfaction with traditional media outlets during the referendum campaign saw many people turning to alternative media formats and, crucially, to social media platforms to engage with the referendum debate. Since their emergence, social media platforms have been routinely linked to inclusive political participation and a democratisation of politics (Graham et al. in The Media, Political Participation and Empowerment. Routledge, Abingdon, 2013; Larsson and Moe in New Med Soc 14:729–747, 2011; Papacharissi in New Med Soc 4:9–27, 2002; Temple in The Media, Political Participation and Empowerment. Routledge, Abingdon, 2013). Thus, social media platforms appeared uniquely suitable to foster political participation and deliberation during the referendum campaign by providing an alternative environment for political debate. Examining the participatory potential of social media platforms in the referendum debate, this chapter considers how users engaged with the referendum onlineTwitter. Specifically, this chapter focuses on how parts of the public participated and interacted with the referendum debate on the social media networking site Twitter. It uses network analysis to examine the networks of communication which emerged as a result. Against the backdrop of contested live debates on the suitability of online platforms in generating and supporting political participation and deliberation, this chapter adds to the analysis of referendum-related popular participation and grassroots activism on the groundon the ground (Chapter 4 ) and considers related potentials and limitations.