When someone makes a prediction, people post it to the site along with a brief description and a URL. We monitor it and change its status to true or false when appropriate.
They want significant, empirically testable predictions made by public figures, that have no more than a five-year horizon. Topics (thus far) are politics, technology, and finance.
Research has shown that experts make predictions at a rate worse than chance. This site exists in order to hold people and media outlets accountable for pretending to see into an unpredictable future.
And despite being often-wrong, they keep at it. And people still listen to them and cite them as authorities.
Betelgeus goes supernova on 21 December 2012 (local time). All long travelers were alerted to say the Hell way from the neighborhood some 640 years ago (local time).