Facebook is undoubtedly the social network reference. Its development in recent years has been forced to walk in the world. Created in 2004, Facebook now claims (09 March 2010) over 400 million users worldwide.

Between 2004 and 2009, growth has been exponential as indicated in the figures below, whose data are based on Google Insight, a good measure of mouth on the Web. Let’s see in images below :
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