Abstract. Social media enables a new model of managing knowledge that involves formal and informal communication, collaboration using a variety of applications. Using a case study approach, this article investigates the affordances of such Social Media enhanced Platforms (SMeP) for the management of knowledge work (communication and collaboration). In particular it aims to address the following research questions: What are the affordances of SMeP for the management of knowledge work in a voluntary organization? How do individuals experience the opportunities and challenges of these collaborative platforms? This paper presents the results of an empirical study on the adoption and use of social media in a voluntary organization. The findings pinpoints towards the potential use of SMeP for shaping new work practices but also towards the issues encountered when social media is introduced in organizations.