About: http://webisa.webdatacommons.org/299624568

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	Yes, and here is a plugin I just released to help for the purposehttp://buddydev.com/buddypress/introducing-join-blog-widget-for-wordpress-multisite/Hope that helps.
http://www.w3.org/ns/prov#wasQuotedFrom	buddydev.com