Online retail catalogs pioneered the earliest applications of faceted search, reflecting both the faceted nature of product data (most products have a type, brand, price, etc.) and the ready availability of the data in retailers' existing information-systems. In the early 2000s retailers started using faceted search. A 2014 benchmark of 50 of the largest US based online retailers reveals that despite the benefits of faceted search, only 40% of the sites have implemented it.  Examples include the filtering options that appear in the left column on or Google Shopping after a keyword search has been performed.