7. The non-transitory computer readable storage medium as recited in claim 6 , wherein the one or more categories are positive categories that identify the distinct group of items that the user wants included among the one or more items.
6. The non-transitory computer readable storage medium as recited in claim 1 , further comprising instructions that cause the computer system to present through the user interface one or more categories associated with the one or more items for selection by the user that will limit the plurality of items to a distinct group of items.