Can I control ad content?

No one wants ads from their competitors on their Web site. Even if you’re not selling anything from your site, it’s likely that some ads you just don’t want shown on your site. Fortunately, Google’s made it possible to exclude some companies from showing their ads on your site. It’s not too difficult to do; simply ad your competitors’ URLs (Uniform Resource Locator, the Web address) to your ad filters, and the competition is then blocked from advertising on your site.