Facebook now has more than 250m active users

"General Growth
More than 250 million active users
More than 120 million users log on to Facebook at least once each day
More than two-thirds of Facebook users are outside of college
The fastest growing demographic is those 35 years old and older
User Engagement
Average user has 120 friends on the site
More than 5 billion minutes are spent on Facebook each day (worldwide)
More than 30 million users update their statuses at least once each day
More than 8 million users become fans of Pages each day
Applications
More than 1 billion photos uploaded to the site each month
More than 10 million videos uploaded each month
More than 1 billion pieces of content (web links, news stories, blog posts, notes, photos, etc.) shared each week
More than 2.5 million events created each month
More than 45 million active user groups exist on the site"
Source: Facebook press statistics, retrieved 16th July 2009.
For growth levels, compare to this set, retrived on 9th April 2009