Facebook hits one billion users

Co-founder 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."

Interviewed on the NBC Today show, he called the milestone "unbelievable."

"To be able to come into work every day and build things that help a billion people stay connected with the people they care about every month, that's just unbelievable," Zuckerberg said.

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