Research has been published in prestigious - Human Computation 2012 and WWW 2013 conference.
See the Presentation Slides here -
http://www.aaai.org/ocs/index.php/WS/AAAIW12/paper/view/5208
http://wic.litislab.fr/
Read blog post on Google's Blog -
http://crowdresearch.org/blog/?p=3436