Roman Tilly Oliver Posegga Kai Fischbach Detlef Schoder What is Quality of Data and Information in Social Information Systems? Towards a Definition and Ontology. 2015 ICIS http://aisel.aisnet.org/icis2015/proceedings/ConferenceTheme/1 conf/icis/2015 db/conf/icis/icis2015.html#TillyPFS15