LinkedIn, a professional networking platform and business-oriented social networking site, was founded in December 2002 and launched in May 2003.   As of November  2009 it had more than 45 million registered users,…

LinkedIn is a business-oriented social networking site founded in December 2002 and launched in May 2003 mainly used for professional networking.  As of February 2009 it had more than 35 million registered…