1. A computer-implemented method comprising: a) accepting, a computer system having at least one computer in a network, one or more keywords input by an advertising user; b) determining, by the computer system, a set of one or more vertical taxonomy categories using at least one of the one or more keywords, wherein each of the vertical taxonomy categories has at least one Web document associated with it, and wherein the at least one Web document participates in an advertising network; c) presenting, by the computer system, at least one of the set of one or more determined vertical taxonomy categories to the advertising user as an ad targeting suggestion; d) accepting, by the computer system, an advertiser selection of a suggested vertical taxonomy category; and e) targeting, by the computer system, the serving of an ad of the advertiser to each of the at least one Web document associated with the selected suggested vertical taxonomy category.