The author quotes Page and Brin's original paper: > “Currently, the predominant business model for commercial search engines is advertising. The goals of the a

The author quotes Page and Brin's original paper: > “Currently, the predominant business model for commercial search engines is advertising. The goals of the advertising business model do not always correspond to providing quality search to users. For example, in our prototype search engine one of the top results for cellular phone is “The Effect of Cellular Phone Use Upon Driver Attention”, a study which explains in great detail the distractions and risk associated with conversing on a cell phone while driving. This search result came up first because of its high importance as judged by the PageRank algorithm, an approximation of citation importance on the web [Page, 98]. A search for cellular phone now returns a page of links to plans, and one link to Wikipedia.