1. A method for use with a first mobile device application (first app) suitable for running on devices of at least a first device type, the method comprising: collecting first-device-type risk-relevant data associated with a first app from a first plurality of devices, with each device of the first plurality of devices being of the first device type; analyzing the first-device-type risk-relevant data to generate first-device-type risk characteristic data corresponding to the first device type; and associating the first-device-type risk characteristic data as first risk metadata with the first app.