About: http://webisa.webdatacommons.org/412372065

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	I am not sure if it checks tables other than posts & comments, might be worth checking out /wp-admin/options.php for a quick glance and see if you spot anything odd.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com