From the Facebook Press Room :

General Growth
  • More than 300 million active users
  • 50% of our active users log on to Facebook in any given day
  • The fastest growing demographic is those 35 years old and older
User Engagement
  • Average user has 130 friends on the site
  • More than 6 billion minutes are spent on Facebook each day (worldwide)
  • More than 40 million status updates each day
  • More than 10 million users become fans of Pages each day
Applications
  • More than 2 billion photos uploaded to the site each month
  • More than 14 million videos uploaded each month
  • More than 2 billion pieces of content (web links, news stories, blog posts, notes, photos, etc.) shared each week
  • More than 3 million events created each month
  • More than 45 million active user groups exist on the site
International Growth
  • More than 65 translations available on the site
  • About 70% of Facebook users are outside the United States
Platform
  • More than one million developers and entrepreneurs from more than 180 countries
  • Every month, more than 70% of Facebook users engage with Platform applications
  • More than 350,000 active applications currently on Facebook Platform
  • More than 250 applications have more than one million monthly active users
  • More than 15,000 websites, devices and applications have implemented Facebook Connect since its general availability in December 2008
Mobile
  • There are more than 65 million active users currently accessing Facebook through their mobile devices.
  • People that use Facebook on their mobile devices are almost 50% more active on Facebook than non-mobile users.
  • There are more than 180 mobile operators in 60 countries working to deploy and promote Facebook mobile products.