Experian Hitwise released some statistics about Facebook (fb) which go a long way to explaining why the Facebook IPO is the only thing people are talking about in this third week of May.  Take a look at some of their findings:
1.    In April 2012 fb received 9% of all US internet visits.  This translates to more than 1.6 billion visits per week.
2.    Facebook.com has received more than 400 billion page views so far in 2012.
3.    56% of the audience is female.
4.    It has been the number one website in the US since March 9, 2010.  It is also the most searched for term (Facebook) in the US and has been since July 2009.
5.    Facebook is the number one social networking site in the US, Canada, UK, Brazil, France, Australia, New Zealand, Hong Kong and Singapore.  It is the number one overall site in all of those except UK, Brazil, France and Australia.
The report has many more numbers to sink your teeth into, so if you are interested take a further look.