from The New York Times:

Company on the Verge of a Social Breakthrough

Facebook is not only the world’s largest social network, but Mr. Kirkpatrick suggests that it may also “be the fastest-growing company of any type in history.” He reports that over 20 percent of the 1.7 billion people on the global Internet now use Facebook regularly, including 35.3 percent of the American population. The number of users is growing at the remarkable rate of 5 percent a month, he says, and the average user, astonishingly enough, spends almost an hour there each day.