Washington Post Prediction Marketing

...that allows readers to vote on possible outcomes for selected stories. Users will be able to leave their predictions and discuss their beliefs on an integrated comment thread, with the most accurate participants appearing on a leaderboard.

...While there isn’t currently a way to weight one question more than another, the site’s algorithm does take into account the type of question and the accuracy rate of participants. Besides the Washington Post, Predictify is also found on The New York Times and San Francisco Chronicle’s sites.

To offer an incentive for users to take part in the polls, the site has also implemented a premium program that allows companies to sponsor a poll and reward the most accurate participants with cash. In return, these sponsors are entitled to the demographics data that the service asks for with each vote.