About: http://webisa.webdatacommons.org/423690834

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	I do not think you can use it for a recommendation, but you could mention that person was a mentor to you.
http://www.w3.org/ns/prov#wasQuotedFrom	metafilter.com