1. A method comprising the acts: (a) receiving an image captured with a user's portable device; (b) identifying a first set of plural images that are related to the captured image, said images each having associated metadata, including content descriptive metadata; (c) identifying a subset of the metadata; (d) identifying a second set of plural images based on metadata of images in the first set; and (e) submitting image data, together with metadata, to an image-responsive service, to take an action based thereon, wherein at least one of said submitted image data or said submitted metadata is identified by acts (b)-(d), and wherein said submitting is performed by a processor-controlled device configured to perform such act.