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Yandex data for leading search engines in Russia. Yandex is probably the biggest search engine few people have ever heard of. The Russian search engine has surpassed Microsoft's Bing in the world's top search engine rankings, according to Search Engine Watch, which got its data from ComScore.
Known as Tiger, the new index-serving technology has been incorporated into Bing globally since August 2011. In May 2012, Microsoft announced another redesign of its search engine that includes Sidebar, a social feature that searches users' social networks for information relevant to the search query.