1. A method for sharing sensor data, the method comprising: receiving, at a first mobile device over a wireless connection with a second mobile device, an authorization to receive sensor data directly from the second mobile device, the authorization including an identifier that uniquely identifies the second mobile device retrieving, using the identifier, authorization rights associated with the second mobile device, wherein the retrieving comprises retrieving the authorization rights from a permission table including a list of one or more mobile devices authorized to receive the sensor data from the second mobile device; receiving, at the first mobile device over the wireless connection with the second mobile device, in accordance with the authorization rights, information from the second mobile device, the information including the identifier and sensor data from one or more sensors in the second mobile device, the one or more sensors including at least one motion sensor and the sensor data including motion data from the at least one motion sensor; and determining, by the first mobile device, a motion state of the second mobile device based on an analysis of the sensor data and the identifier.