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Why Google+ is Not in Top 3
By siliconindia
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Tuesday, 27 September 2011, 23:10 IST
Yahoo! Answer
Yahoo! Answers is a community-driven question-and-answer (Q&A) site or a knowledge market launched by Yahoo! on July 5, 2005 that allows users to both submit questions to be answered and answer questions asked by other users.
Yahoo! Answer is the top 4th social networking site with 2.9 million U.S. visits.
