Fundoo is a unique opinion trading app that allows users to buy and sell opinions like stocks. With Fundoo, users can make predictions about various topics, such as politics or entertainment, and earn rewards for accurate predictions. The app utilizes a crowdsourcing model, where users can see how other investors predict and trade opinions accordingly. With its user-friendly interface and innovative concept, Fundoo is quickly gaining popularity as a fun and engaging way to interact with the world of opinions.