1. A first mobile device comprising: a sensor comprising an accelerometer for outputting movement information; a display screen; memory storing instructions for execution by a processor; and one or more processors programmed with said instructions for: obtaining movement information from the sensor; selecting a user profile from among a plurality of different user profiles based on the movement information, in which the plurality of different user profiles comprises a social media profile and a retail profile; and selecting—based on a selected user profile—an image or graphic for display on the display screen, the image or graphic being associated with the selected user profile, in which said on or more processors are configured to enable transfer of the selected user profile to a second mobile device.