www.dogpile.comDogpile incorporates the search functionality of multiple search engines (including Google and Yahoo!), eliminates duplication, and returns the results in relevance ranking. Dogpile does track, store, and harvest searching data, so be aware!
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Google Chrome extension does provide some privacy; however, per the extension:
Sites you visit from our search engine results page may log your usage per their site terms and conditions. Further, if requested by court order, records or logs will be made available, to law enforcement and investigative agencies.