Now, 1.35 billion people use Facebook at least once a month, up 14 percent over the same time last year.
As USA Today's Jon Swartz pointed out on Twitter, that nearly equals China, the world's most populous country:
And it's more than four times the population of the United States.
(Facebook is for the most part blocked in China, though CEO Mark Zuckerberg was there last week and showed off his Mandarin skills.)
Although Facebook's stock price dropped 9 percent in after-hours trading on Tuesday, it has reached record highs in recent days, pushing the value of the company even higher. As of the market's close on Tuesday, Facebook's market capitalization was over $208 billion, more than longer established companies like Walt Disney, Nike, Bank of America and Coca-Cola.