<http://webisa.webdatacommons.org/prov/227593692> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/2544579> . <http://webisa.webdatacommons.org/2544579> <http://www.w3.org/ns/prov#value> "Companies such as Zynga and Playfish sell virtual goods tousers who play games such as Mob Wars and Restaurant City." . <http://webisa.webdatacommons.org/2544579> <http://www.w3.org/ns/prov#wasQuotedFrom> <slideshare.net> . <http://webisa.webdatacommons.org/2544579> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/prov/341459263> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/2544579> .