I think it's easy to justify only including the top two search engines, or at least the search engines with >10% market share (1), for the sake of keeping the c

I think it's easy to justify only including the top two search engines, or at least the search engines with >10% market share (1), for the sake of keeping the choices uncluttered. By this article's logic, should they also include barnesandnoble.com, since they include amazon, and ubid.com since they include ebay? 1. http://searchenginewatch.com/showPage.html?page=2156451 http://searchenginewatch.com/showPage.html?page=2156451