24. The computer-implemented method of claim 14 wherein determining a set of one or more taxonomy categories using at least one of the one or more media properties includes determining a set of one or more semantic clusters using the accepted one or more media properties, and determining a set of one or more taxonomy categories using at least some of the one or more semantic clusters.
14. A computer-implemented method comprising: a) accepting, by a computer system having at least one computer in a network, information about one or more media properties identified by an advertising user; b) determining, by the computer system, a set of one or more taxonomy categories using at least one of the information of the one or more media properties, wherein each of the taxonomy categories has at least one media property associated with it, and wherein the at least one media property participates in an advertising network; c) presenting, by the computer system, at least one of the set of one or more determined taxonomy categories to the advertising user as an ad targeting suggestion; d) accepting, by the computer system, an advertiser selection of a suggested taxonomy category; and e) targeting, by the computer system, the serving of an ad of the advertiser to each of the at least one media property associated with the selected suggested taxonomy category.