DexKnows.com differs from traditional yellow pages in that it is online rather than in book format and it provides services that yellow pages cannot, such as driving directions, reviews and ratings. The site is owned by Dex Media and is one of many online directories.
Directories such as DexKnows.com make their money from businesses that pay for listings. The problem with this model is that businesses only pay directory sites that have enough traffic to justify the cost, as domain broker Morgan Linton points out. While such directories are very common because of the minimal start-up cost, few make money because the business model requires significant search engine optimization in order to lure traffic to the site.