Want life to be more like a game? Amp up the (friendly) competition with ChallengeLoop, a new app that allows users to propose and compete in a multitude of “challenges.” Users can pose any challenge to their friends or to strangers, from fitness competitions to scavenger hunts, all the while posting play-by-play photos to the app and Facebook of the competition and final victory (or defeat). You can even challenge yourself to accomplish a difficult task, and use the app to track milestones and get encouragement from digital spectators. For its launch, ChallengeLoop dreamed up the Steve Jobs Challenge, challenging competitors to wear a black turtleneck one day this week (June 11-15th) in honor of Steve Jobs! A black turtleneck in June? Yeah, that is a challenge.