Dojima
Five calls every morning. Beat the crowd's forecast and your friends.
Every day there's a fresh board of yes/no questions about politics, sports, markets, pop culture and the world, with the crowd's forecast from real prediction markets. Make up to five calls, and see who called it in your league. The less the crowd expected it, the more a right call scores.
Dojima is free and uses points only. There's no money, no purchases and no prizes.