Web 2.0 Broker: A standards-based service for spatio-temporal search of crowd-sourced information

► Discovery of crowdsourced data to be integrated in geospatial infrastructures. ► Concealing citizen's information and authoritative data. ► New middleware components in SDI to integrate new data sources. ► Increasing availability of crowdsourced data in SDI. ► Assisting decision making by providing new sources of social information.