Google's knowledge graph was in part based on Freebase, a large open knowledge base written by Metaweb. Google acquired Metaweb, continued to grow it's triple e

Google's knowledge graph was in part based on Freebase, a large open knowledge base written by Metaweb. Google acquired Metaweb, continued to grow it's triple extractors [1] and eventually shut write access to the graph. Wikidata is slowly extracting information from the last public version of Freebase to grow out their own knowledge base. [1] http://www.cs.ubc.ca/~murphyk/Papers/kv-kdd14.pdf http://www.cs.ubc.ca/~murphyk/Papers/kv-kdd14.pdf