About: http://webisa.webdatacommons.org/74466479

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	(please do not respond saying that captchas are a waste of time etc... i am simply only interested in finding out how Twitter and Facebook are implementing captchas when they detect something suspicious :-)
http://www.w3.org/ns/prov#wasQuotedFrom	webdeveloper.com