Facebook users in the U.S. and Canada are the most valuable

Facebook makes the majority of its revenue off of users in the U.S. and Canada, but its user growth in those countries has slowed dramatically. 

By the numbers: A Facebook user in the U.S. is 3 times more valuable than a Facebook user in Europe, 10 times more valuable than a Facebook user in the Asia-Pacific region, and 15 times more valuable than a user in the rest of the world. The U.S. is by far the world's most lucrative ad market, worth over $200 billion, per estimates from Zenith, a global media agency. China, where Facebook is blocked, is the second biggest, at $87 billion. Japan is a distant third at $43 billion.