To keep its revenue growing, Facebook needs to look outside the US (FB)

Yesterday, Facebook reported its Q3 earnings, beating expectations for user numbers and revenue. Despite its continual growth, Facebook has repeatedly warned that because it can only show so many ads, its revenue growth will eventually have to slow. 
As we can see in this chart from Statista, U.S. and Canada based users make the company the most money, but represent the smallest group of users. Active Facebookers in the U.S. and Canada generate $21.20 per person in adver