FACEBOOK says it now has more than one billion users, but worries remain about how the social networking site can make money from members.
Co-founder and chief executive Mark Zuckerberg made the announcement, saying the number is "humbling".
"This morning, there are more than one billion people using Facebook actively each month," he said in a statement.
"Helping a billion people connect is amazing, humbling and by far the thing I am most proud of in my life."
The social network reached one billion monthly active users on September 14, according to Mr Zuckerberg. That includes 600 million mobile users.
Since Facebook's launch, users have produced more than 1.13 trillion likes, 140 billion friend connections and have uploaded 219 billion photos.
Read more at ABC news online.