Despite all of the other chat apps out there, this is my favorite at the moment. It’s not Yo, it’s not Slingshot, it's not SnapChat—it’s Fuse! Fuse uses the contact list on your phone and it lets you make groups where you can share posts and comments. The magic is that you can give every post a “fuse”, a timer of ten, five or three mins. Once the timer ends, the image disappears forever. It creates a playful sense of urgency, delight and mystery.