About: http://webisa.webdatacommons.org/58648466

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	So you would want to check the IPaddress when the form was submitted to your server and then identify it there whether the submitted was a spammer or a regular user.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com