9. The system of claim 8 , wherein the instructions, when executed by the processor, further cause the processor to: browse an online directory of businesses providing products or services, the online directory being organized into categories of businesses; select a set of potential categories for testing using test advertisements, the set of potential categories being selected from the categories of businesses of the online directory; select the respective set of businesses associated with each potential category; and rate the respective connection between each potential category and the respective set of businesses associated with the potential category.
9. The system of claim 8 , wherein the instructions, when executed by the processor, further cause the processor to: browse an online directory of businesses providing products or services, the online directory being organized into categories of businesses; select a set of potential categories for testing using test advertisements, the set of potential categories being selected from the categories of businesses of the online directory; select the respective set of businesses associated with each potential category; and rate the respective connection between each potential category and the respective set of businesses associated with the potential category. 12. The system of claim 9 , wherein rating the respective connection between each potential category and the respective set of businesses associated with the potential category is based at least in part on a percentage of visitor traffic to the set of businesses associated with the potential category.