Facebook, the leading social media network on virtual world was launched by Mark Zuckerberg, Dustin Moskovitz, Chris Hughes and Eduardo Saverin in the year 2004. From 2004, Facebook has undergone many changes by allowing the users to add photos and work networks etc. In September 2006, the Facebook has let anyone join the network.
For first time in August 2008, Facebook has allowed its users to communicate with each other via a chat option and to enhance its overall revenue, Facebook has introduced engagement Ads in December, 2008. From the year 2004 – 2010, there have been large number of internet users signed up with the Facebook and by July, 2010 the total active users on Facebook has reached 500 million users.