Abstract
Today, 300+ million people have a Facebook account online. In less than 6 years, this website has been able to reach a quarter of the whole internet population. Facebook is now, the leading online social network and is a game changer in the internet world. Online social networks are becoming a new market that have to be explored if we want to understand how it is going to evolve in the incoming years. If we look at it through a rational point of view, there is no reason people would be willing to share any information of their private life in front of thousands of strangers. Why does the whole world want to connect through this network? What is this new world community that is being created? How did it emerge? More than a technology change, this is about a spirit change. Internet grew up due to the idea that anyone could put his own content online but what is called Web 1.0 is a very static, technical and quite difficult way of making information available on Internet. Web 2.0 is a set of new ideas, designs and development processes that makes the user the central content generator of the site thanks to concepts like tags, comments, interactive links, ratings, easy picture, video, link posts etc.
