About: http://webisa.webdatacommons.org/429795713

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	Screen too small, annotating on documents is a pain, non-native PDF support is a pain, lack of open-source-ness was a BIG factor.
http://www.w3.org/ns/prov#wasQuotedFrom	boingboing.net