Including the quality of the news organization. How much of this system is currently in use by the search engine giant is unknown. Primitive search engines are expected to organically evaluate links based on how closely the keywords typed in the search field match an object link, and how many other links are attached to the object. Then a measure of relevance is calculated before returning a reply. SEO) campaigns which can, if done effectively, skew results to certain domains. A challenge for Google.