About: http://webisa.webdatacommons.org/389576831

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 believe it is this kind of spam filter, cases where there is a legitimate reason to send mail to thousands of recipients without letting the recipients see each other's addresses, that the original poster was referring to.
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org