http://en.wikipedia.org/wiki/Aardvark_(search_engine)
Aardvark is a social search service that connects users live with friends or friends-of-friends who are able to answer their questions. Users submit questions via the Aardvark website, email or instant messenger and Aardvark identifies and facilitates a live chat or email conversation with one or more topic experts in the asker's extended social network. Users can also review question and answer history and other settings on the Aardvark website. On February 11, 2010 Aardvark was acquired by Google for $50 million.alternative: Answerbag, Google Answers, Wiki Answers
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