Issue No. 04 - July-Aug. (2013 vol. 28)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/MIS.2013.119
Wikipedia was recently enhanced by a knowledge base: Wikidata. Thousands of volunteers who collect facts and their sources help grow and maintain Wikidata. Within only a few months, more than 16 million statements about more than 4 million items have been added to the project, ready to support Wikipedia and to enable and enrich many different types of external applications.
Wikipedia, Knowledge based systems
D. Vrandecic, "The Rise of Wikidata," in IEEE Intelligent Systems, vol. 28, no. 4, pp. 90-95, 2013.