The recent advent of Web 2.0 has placed individuals, their information and their social connections to the center of the Internet stage: the Internet has evolved from being an academic and business tool, to one of the prime means for casual everyday people to network, communicate, publish and exchange all sorts of different data, and to collaborate on projects and activities. GeoWeb 2.0 is the geographic embodiment of the Web 2.0 vision for the next generation of geographic information publishing, discovery and use on the Web. In this context, GEOSTREAM aims at providing novel techniques and tools for extracting, processing, and exploiting user-generated geospatial information on the Web.