A billion users isn't cool. You know what's cool? Two billion users. On Tuesday—five years after hitting a billion monthly users—Facebook announced it has hit 2 billion monthly users, TechCrunch reports. That makes it the largest social media network in the world; USA Today notes it now has a bigger "population" than any country. "We're making progress connecting the world, and now let's bring the world closer together," Mark Zuckerberg said in a Facebook post. But if Facebook truly wants to connect the entire world, it's going to need to find a way to reach the 15% of people who live in areas with no internet access and the many more who can't afford internet access. It also needs to get itself unblocked in China. (More Facebook stories.)