• LinkedIn is a business-related social networking site. Launched in May 2003. One year before Facebook.• As of 3 November 2011, LinkedIn reports more than 135 million registered users in more than 200 countries.• LinkedIn has many feature that Facebook does not.
• It was created in March 2006, 2 years after Facebook.• The service rapidly gained worldwide popularity, with over 300 million users as of 2011.• Twitter claims to have many advantages over Facebook
• The service was launched on June 28, 2011, in an invitation- only "field testing" phase but early invites were soon suspended due to an "insane demand" for new accounts.• On January 19, 2012, it was reported that Google+ had surpassed a user base of 90 million• Some people say Google+ has it all; that it is the perfect mix between Facebook and Twitter.• There are also many benefits of using Google+ than there are to using Facebook.
• MySpace was launched in August 2003.• In August 2011, MySpace had 33.1 million unique U.S. visitors.• From 2005 until early 2008, MySpace was the most visited social networking site in the world, and in June 2006 surpassed Google as the most visited website in the USA.• MySpace has very few unique aspects to it that would give it the edge over Facebook.