LinkedIn Logo — LinkedIn is a website aimed at business, was founded in December 2002 and launched in May 2003 (comparable to a service social network ), mainly for professional networking . Founder Reid Hoffman, Allen Blue, Konstantin Guericke, Eric Ly and Jean-Luc Vaillant.
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In October 2008 , had more than 25 million registered users in March extending to 150 industries. In April 2011 , has more than 100 million registered users, four of more than 200 countries, covering all companies in the Fortune magazine list of the 500 largest U.S. companies. It is followed in a distant second by Viadeo . More