Search engine optimization different signals. The leading search engines, Google, Bing, and Yahoo, do not disclose the algorithms they use to rank pages. Some SEO practitioners have studied different approaches to search engine optimization, and have shared their personal opinions. Patents related to search engines can provide information to better understand search engines. In 2005, Google began personalizing search results for each user. Depending on their history of previous searches, Google crafted results for logged in users. In 2007, Google announced a campaign against paid links that transfer PageRank. On June 15, 2009, Google disclosed that they had taken measures to mitigate the
Search engine privacy to mean that people had the right to request that some information about them be wiped from search results provided by search engine companies like Google. The background of this case is that one Spanish citizen, Mario Costeja Gonzalez, set out to erase himself from Google's search results because they revealed potentially compromising information about his past debts. In the ruling in favor of Mario Costeja Gonzalez, the court noted that search engines can significantly impact the privacy rights of many people and that Google controlled the dissemination of personal data. This court decision did not claim that all citizens