The use of digital signage for informal learning on campus remains a less unexplored research area. In this paper, we present a mixed digital signage and multi-touch interaction environment that encourages students to engage in a watch-and-play style for social learning at a public place. To realize the key factors influencing students' engagement and satisfaction with our system, we developed a user study model based on the updated D&M IS Success Model and the Technology Acceptance Model. The integrated model contains six constructs: system quality, information quality, interaction quality, perceived usefulness, perceived ease-of-use, and user satisfaction. Empirical result indicates the proposed system is very promising. However, user study on our research model also validated some system design problems that must be solved to make the proposed system a great learning aid in the foreseeable future. The findings of this study can provide useful guidelines for researchers interested in developing advanced social learning systems.