One Billion People on Facebook - Facebook Newsroom

Mark Zuckerberg on a Facebook milestone

"This morning, there are more than one billion people using Facebook actively each month.
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."

Other stats from a fact sheet referenced in the post:

"Since Facebook launched, we’ve seen:
• Over 1.13 trillion likes since launch in February 2009
• 140.3 billion friend connections
• 219 billion photos uploaded" 

One Billion People on Facebook - Facebook Newsroom