Why Google+ is Not in Top 3
By siliconindia   |   Tuesday, 27 September 2011, 23:08 IST
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LinkedIn
LinkedIn
LinkedIn is a business-related social networking site which is in the 6th place. Founded in December 2002 and launched in May 2003, it is mainly used for professional networking. LinkedIn reports more than 120 million registered users, spanning more than 200 countries and territories worldwide.

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