About: http://webisa.webdatacommons.org/40510821

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Look at the wikipedia article quoted in the OP. There is a section about
http://www.w3.org/ns/prov#wasQuotedFrom	democraticunderground.com