A method and a system for maintaining the freshness of a search engine server's database. A popularity parameter is defined, and a popularity value is assigned to each link in the search engine's database. The most popular links are selected for updating the contents stored, or associated with, the site...http://www.google.de/patents/US7627568?utm_source=gb-gplus-sharePatent US7627568 - Method and system for updating a search engine database based on popularity of links
