1. One or more computer-readable media comprising computer-executable instructions for deriving advertising targeting metrics for a user from images associated with the user, the computer-executable instructions performing steps comprising: obtaining user identity information associated with the user; searching image-centric sites for public images associated with the user by referencing the obtained user identity information; filtering images obtained from the searching to retain only those images that are determined to comprise the user or that are determined to have been taken by the user; deriving advertising targeting metrics for the user by identifying physical attributes of the user from the filtered images; deriving advertising targeting metrics for the user by deducing the user's preferences from the filtered images; and storing the derived advertising targeting metrics for the user with the obtained user identity in a user store.