Thank you to everyone who contributed their ideas and suggestions, it was extremely useful and interesting. Here a little list I compiled with the suggestions on the topic: - Adamoli, G. C. E. (2012). *Social media and social movements: A critical analysis of audience’s use of Facebook to advocate food activism offline*(Ph.D.). The Florida State University, United States -- Florida. Retrieved from http://search.proquest.com.ezproxy.its.uu.se/docview/1287170216/abstract?acc... - Bastos, M. T. (2012). Public Opinion Revisited: The propagation of opinions in digital networks. *Journal of Arab & Muslim Media Research*, *4*(2), 185–201. doi:10.1386/jammr.4.2-3.185_1 - Dean, J. (2003) Why the Net is Not a Public Sphere. *Constellations*volume 10, issue 1, pp. 95-112 (March). - Papacharissi, Z. (2010). *A Private Sphere: Democracy in a Digital Age*. Cambridge: Polity Press. - Poor, N. (2005). Mechanisms of an Online Public Sphere: The Website Slashdot. *Journal of Computer-Mediated Communication*, *10*(2), 00–00. doi:10.1111/j.1083-6101.2005.tb00241.x - Valtysson, B. (2012). Facebook as a Digital Public Sphere: Processes of Colonization and Emancipation. *tripleC: Communication, Capitalism & Critique. Open Access Journal for a Global Sustainable Information Society*, *10*(1), 77–91. Plus some comments on more literature from Mathieu ONeil: Lincoln Dalhberg has written several articles about the Internet as a (Habermasian or not) public sphere, he also edited a book called Radical Democracy and the Internet which may suit your purposes (once again before the term "social media" became popular but the issues are the same) There is also an article by Froomkin about Usenet as a form of PS (2003) and more recently some Scandinavian scholars wrote a paper about whether WP conformed to deliberative rationality, may be too specific for you. I am glad to realise that the debate about social media and the public sphere(s) is alive and well! Cheers and thanks again, Oriol PS: regarding the offlist, I didn't expect many people to answer - certainly not so fast - and since I do not check the AoIR list every day, I preferred to give an alternative email address that I check more frequently so that I could respond in due time.