About: http://webisa.webdatacommons.org/225938511

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	The best thing is that it is usually free because the owners of the social networking sites know that they can obtain revenue from advertisers so they don???t have to charge for membership.
http://www.w3.org/ns/prov#wasQuotedFrom	betternetworker.com