LinkedIn is a business-oriented social networking site. Founded in December 2002 and launched in May 2003, it is mainly used for professional networking. As of 8 April 2010 (2010 -04-08), LinkedIn had more than 65 million registered users, spanning more than 200 countries and territories worldwide. The site is available in English, French, German, Italian, Portuguese and Spanish.

LinkedIn’s CEO is Jeff Weiner, previously a Yahoo! Inc. executive. The company was founded by Reid Hoffman and founding team members from Paypal and Socialnet.com (Allen Blue, Eric Ly, Jean-Luc Vaillant, Lee Hower, Konstantin Guericke, Stephen Beitzel, David Eves, Ian McNish, Yan Pujante, and Chris Saccheri)

Founder Reid Hoffman, previously CEO of LinkedIn, is now Chairman of the Board. Dipchand Nishar is Vice President of Products. LinkedIn is headquartered in Mountain View, California, with offices in Omaha, Chicago, New York and London. It is funded by Greylock, Sequoia Capital, Bain Capital Ventures, Bessemer Venture Partners and the European Founders Fund. LinkedIn reached profitability in March 2006.

On June 17, 2008, Sequoia Capital, Greylock Partners, and other venture capital firms purchased a 5% stake in the company for $53 million, giving the company a post-money valuation of approximately $1 billion.