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
Bilingual search engine Bilingual search engine A bilingual search engine provides multiple language search pages when users type keyword in one language. Obviously, this kind of search engine will give more detailed information for people who speak more than one language, although many mainstream search engines provide multiple languages services. However, the difference between a bilingual search engine and a multiple language search engine is a bilingual search engine will translate keyword from one language to another automatically. Google also published a plug-in (Bilingual Search Suggestion) for Chrome browser to meet the requirement of bilingual search,but it was canceled and unable be found