About: http://webisa.webdatacommons.org/139281886

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 you are right, ning is the best but you are not fully in control of the of your site, like for example the Advertisement is publish by NING.If I have social networking website, I want to be fully in control the site.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com