Facebook, the world's most popular social networking site with an estimated 845 million active

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subscribers, has turned eight.

Since its launch on February 4, 2004 at Harvard University in Mark Zuckerberg's dormitory room, the social networking giant that has changed our lives over the years has witnessed massive growth and is most likely to have one billion users by August this year.

While, the company CEO Zuckerberg is best known as the man who built Facebook, the company has three other co- founders, all college roommates and fellow students at Harvard; Eduardo Saverin, Dustin Moskovitz, and Chris Hughes.

The four initially built the service exclusively for Harvard students, but it was soon expanded to other colleges and eventually added support for students at various other universities. Initially before it's public launch, it was called 'thefacebook.Com'.

However, on February 4, 2008, Zukerberg renamed to domain name and launched what we know today as 'Facebook'. It now seems almost impossible to imagine life without Facebook status updates, friend requests, relationship statuses or photo tags. Facebook has not only put Zukerberg in the list of top and youngest millionaires but also helped a lot of start ups, non profits and other companies grow, interact and increase sales.

In January 2009, Compete.Com study ranked Facebook as the most used social networking service by worldwide monthly active users. Quantcast estimates Facebook has 138.9 million monthly unique US visitors in May 2011. According to Social Media Today, in April 2010 an estimated 41.6% of the US population had a Facebook account.

In India, Facebook has registered a growth of 132% this year, which is higher than many other countries. In some countries, such as Turkey or Chile, up to 80% of Internet users are registered with Facebook. The Russian Facebook audience exceeds 5 million people.

However, company's market growth has started to stall in some regions, with the site losing 7 million active users in the United States and Canada in May 2011. The company has filed for an initial public offering (IPO) on February 1, 2012.