• LinkedIn started out in the living room of co-founder Reid Hoffman in 2002. • The site officially launched on May 5, 2003. At the end of the first month in operation, LinkedIn had a total of 4,500 members in the network. • Roughly one million new members join LinkedIn every week, at a rate equivalent to a professional joining the site faster than one member per second. • The company is publicly held and has a diversified business model with revenues coming from user subscriptions, advertising sales and hiring solutions.