Facebook apps are rulling in the facebook world. People from all walks of life are using these apps and having fun. One of the biggest band in the world U2 also has something like that in Facebook. Surely you have heard about it but do you know they have lots of apps in Facebook that gives an in depth knowledge about their group? I happened to test some of them and one of them is a Music Quiz created recently. It asks you certain questions about the U2 Rock band and you get to choose the answers. At the end of the quiz you are presented with the results. It is pretty cool and so do numerous other Facebook Apps.