The social networking service Facebook.com on Thursday has surpasses more than a billion users, a new milestone.

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.

"If you're reading this: thank you for giving me and my little team the honor of serving you. Helping a billion people connect is amazing, humbling and by far the thing I am most proud of in my life."