Google’s Knowledge Graph derives from Freebase, a proprietary graph database acquired by Google in 2010 when it bought Metaweb. Google's Thakur, who is technical lead on Knowledge Graph, says that significant additional development has been done to get the database up to Google’s required capacity. Based on some of the architecture discussed by Google, Knowledge Graph may also rely on some batch processes powered by Google’s Pregel graph engine, the high-performance graph processing tool that Google developed to handle many of its Web indexing tasks—though Thakur declined to discuss those sorts of details. Microsoft’s Satori (named after a Zen Buddhist term for enlightenment) is a graph-based repository that comes out of Microsoft Research’s Trinity graph database and computing platform. It uses the Resource Description Framework and the SPARQL query language, and it was designed to handle billions of RDF “triples” (or entities). For a sense of scale, the 2010 US Census in RDF form ha - Ho John Lee