This course is about social life in the on-line world. Its focus is on how the design of the interface influences people's interactions with each other and shapes the cultural mores and structures they develop. We will examine the ways social cues are communicated in the real and the virtual world, discuss the limits imposed upon on-line communities by their mediated nature, and explore directions that virtual societies can take that are impossible for physical ones. Readings range from classic papers in cognitive science, anthropology and urban studies to recent studies in the sociology of online communities. The work for this class includes reading articles, analyzing existing systems and designing innovative interfaces. From the course home page: The instructor's own web site for this course is available at http://smg.media.mit.edu/classes/SociableDesign2001/