1. A computer-implemented method comprising: detecting a first user in an image; detecting, by one or more processors, that the first user in the image has performed a gesture that involves the first user passing a mobile computing device to a second user, or about to pass the mobile computing device to the second user; in response to detecting that the first user in the image has performed the gesture, identifying, by the one or more processors, (i) content on the mobile computing device, and (ii) a computing device associated with the second user; and providing the computing device associated with the second user with access to at least a portion of the content.