Motivations for Participation in Socially Networked Collective   Intelligence Systems
  One of the most significant challenges facing systems of collective intelligence is how to encourage participation on the scale required to produce high quality data. This paper details ongoing work with Phrase Detectives, an online game-with-a-purpose deployed on Facebook, and investigates user motivations for participation in social network gaming where the wisdom of crowds produces useful data. 
Jon Chamberlain, Udo Kruschwitz, Massimo Poesio
cs.SI physics.soc-ph