Modern information and communication technologies, especially social media, have profoundly changed the way that people work together.  Organizations must decide on the ways that they can use enterprise social media tools to support their internal and external processes.  Tools such as Facebook, WeChat, Jive, Slack, Socialcast, Periscope, Snapchat, Twitter, and WhatsApp are already used widely in organizations, yet many organizations struggle to use them effectively.  In this course, we study the influence that social media have on organizations from several perspectives.  First, we study the interplay between trends and innovations in society, IT (i.e., social media) and organization.  We provide an overview of the unique characteristics of social media, and discuss the most important theories regarding the use of IT and social media in organizations.  Second, we study the way in which organizations incorporate these new technologies in the work environment, for purposes of communication and collaboration (e.g., teleconferencing, virtual teams), knowledge management and sharing (e.g., via Networks of Practice), and to harness employees' creativity and expertise (e.g., via internal wiki's or innovation platforms). Third, we study how the modern-day professional (i.e., the knowledge worker), makes use of social media to support their everyday work and personal life.  We discuss the consequences of telework (e.g., via cloud-computing) in both professional and private life, we investigate how employees keep in touch with and work together with colleagues (e.g., via WhatsApp/ WeChat or social network sites), and we study how professionals express their professional identity online (e.g., via LinkedIn or Twitter).