Where Are You All? is an application to share the location with your friends when you are going to a gathering or event. By using the application, users can easily update their current location as well as learning the location of their friends. Unlike other location sharing app, no needs to register any accounts or access your social network profile. Share your location with an event key only. That would be a lot easier for sharing location information with friends of friend.The location sharing is in the event only, after the event passed, their geo information will thenbe earsed to reduce privacy leakage.Besides, all geo information collected will be erased once the event is over or deleted by the users.