1. An automatic, computerized method of presenting different profile-targeted advertisements aimed at a plurality of users of a common set-top box comprising: (a) automatically with a computer advertisement server system sending a first transmission to cause presentation of a first television advertisement in association with presentation of a first television program or channel via a first set-top box identified by a first set-top box identifier, based on: (i) an identified relationship between the first television program or channel and a first online user profile; and (ii) a selection of the first television advertisement; and (b) automatically with the computer advertisement server system sending a second transmission to cause presentation of a second television advertisement in association with presentation of a second television program or channel via the first set-top box based on: (i) an identified relationship between the second television program or channel and a second online user profile; and (ii) a selection of the second television advertisement; wherein: (c) the first online user profile contains profile information collected during, or generated as a result of, browsing activity of online content by a first user through a first online user interface device, and the second online user profile contains profile information collected during, or generated as a result of, browsing activity of online content by a second user through a second online user interface device; (d) the first set-top box identifier is associated with both the first online user profile and the second online user profile; (e) the relationship between the first television program or channel and the first online user profile is identified automatically based at least in part on first television preference information, from the first online user profile, and the relationship between the second television program or channel and the second online user profile is identified automatically based at least in part on second television preference information, from the second online user profile; (f) the first television preference information is generated or modified by information collected during browsing activity of online content by the first user with the first online user interface device, and the second television preference information is generated or modified by information collected during browsing activity of online content by the second user with the second online user interface device; (g) the first television preference information indicates a preference for the first television program or channel on the part of the first user, and the second television preference information indicates a preference for the second television program or channel on the part of the second user; (h) the first television advertisement is selected based at least in part on first additional information, from the first online user profile, and the second television advertisement is selected based at least in part on second additional information, from the second online user profile; (i) the first additional information is different from the first television preference information, and the second additional information is different from the second television preference information; (j) the first set-top device, the first online user interface device, and the second online user interface device are separate devices; and (k) which of the first and second television advertisements is selected for presentation in association with which of the first and second television programs or channels depends on differences between the first online user profile and the second online user profile.