Just did some more research, they have outlined a bit here http://www.google.com/insights/consumersurveys/how http://www.google.com/insights/consumersurveys/how

Just did some more research, they have outlined a bit here http://www.google.com/insights/consumersurveys/how http://www.google.com/insights/consumersurveys/how sometimes it unlocks content (and the publisher gets a slip of the fee). It seems that they somehow have you already targeted to a 10% accuracy level based on your search history. Their case studies are also worth checking http://www.google.com/insights/consumersurveys/use_cases http://www.google.com/insights/consumersurveys/use_cases