Yu, BoCai, Guoray2017-04-152017-04-152009GIS has been widely used for supporting decision-making in local communities. However, limited studies have been conducted to use maps directly as a communication tool to support community discussion. In this paper, we explore the potential of using geospatial annotations to facilitate map-based online discussion in local communities. We developed a prototype system, which explicitly links participants' discussion contributions with geographic references. The system is based on conceptual understanding of map-based discussion space, which guides the generation of system requirements. We demonstrate the utility of such systems by a hypothetical scenario of building a Smoke-Free campus in a university community.enText10.1145/1556460.1556492