Online social media have become integral to individuals' media and communication repertoires globally. They provide spaces to meet with friends, reconnect with old acquaintances and gather around shared topics of interest. This chapter presents findings from a qualitative study into the role of online social media in the lives of 25 to 30 year olds in Ireland. The wider research project asks how these sites are enmeshed into everyday life. This chapter focuses on the use of these online social media sites for discursive practices associated with Habermas's (1989) conception of the public sphere, as a space of rational debate among private individuals. Here I report on empirical research carried out between 2008 and 2012 drawing on insights gained from semi structured interviews and online observation carried out with eleven participants. The study aims to gain an insight into their use of online social media focusing here on their attitudes towards posting, online discussion and conceptions of online social media as a discursive space. [For the complete book, "Internet Research, Theory, and Practice: Perspectives from Ireland," see ED575997.]