Special-purpose social sites can offer valuable services to well-defined, closed, communities, e.g., in a university or in a corporation. The purpose of this demo is to show the challenges, special features and potential of a focused social system in action through CourseRank, a course evaluation and planning social system. Categories and Subject Descriptors H.3.4 [Information Storage And Retrieval]: Systems and Software--Information networks; H.3.5 [Information Storage And Retrieval]: On-line Information Services-Data sharing General Terms Design, Human Factors, Management Keywords social sites, course planning, tag clouds, flexible recommendations