Augur (REP) is a prediction market based on the blockchain, where anybody can start new markets, or bet on outcomes of existing markets. Additionally, it can be used to monitor public opinion and forecast the outcomes of events.
Every vote represents real people placing real money on the line in the belief of a particular outcome. Votes are shared publically through the blockchain, which makes it a great place for conducting research. You can even start and promote your question, and get paid for finding out.
As the Augur user base grows, so will this potential for researching human opinions and beliefs, as well as the accuracy of the results gathered. Existing markets already exhibit this kind of "following the leader" mentality, and Augur aims to make it public and completely transparent.
Official Website: http://www.augur.net/