Systems and techniques are disclosed for detecting whether a wearable computing device is worn by a user or not. The detection can be made based on whether the device is secured to a user or based on a sensor. A device worn by a user may be operated in a private mode such that the user wearing the device is provided information that is useful while wearing the device. For example, the user may receive message notifications, news updates, telephone call information, or the like. A wearable computing device maybe operated in a public mode while not being worn by a user. While in the public mode, the device may provide non user specific information such as a current time, media items, or the like.