1. A computer-implemented geographic information system (GIS), including a processor and memory, comprising: a network interface to receive non-cartographic information about a plurality of geospatial entities, each geospatial entity defined in an on-line forum and each geospatial entity having a geometry and located at a physical location, wherein the information is generated in the on-line forum; a database to store the non-cartographic information; and a ranking module configured to prioritize a plurality of geospatial entities for display on a map using the non-cartographic information and according to a ranking mechanism.