26. The non-transitory computer-readable medium of claim 21 wherein the search request includes one or more search terms, and wherein the automatic determining of the product category further includes using information about actions previously taken by other users involving products that are part of the determined product category, the previously taken actions occurring after prior search results were provided to the other users for prior searches by the other users that each included at least one of the one or more search terms.
26. The non-transitory computer-readable medium of claim 21 wherein the search request includes one or more search terms, and wherein the automatic determining of the product category further includes using information about actions previously taken by other users involving products that are part of the determined product category, the previously taken actions occurring after prior search results were provided to the other users for prior searches by the other users that each included at least one of the one or more search terms. 31. The non-transitory computer-readable medium of claim 26 wherein the automatic identifying of the one or more additional products further includes not including one or more further products in the identified additional products based at least in part on the prior search results including the one or more further products and on the previously taken actions of the other users not being based on the one or more further products.