38. Facebook has more users than the population of the U.S., China, and Brazil combined. Do you use Facebook? If you don’t, you’re among a number that gets increasingly smaller every day. In fact, 2 billion active users have an account on the social media platform, which is more than the population of the United States, China, and Brazil combined. Facebook’s co-founder and CEO Mark Zuckerberg posted about the milestone, saying, “We’re making progress connecting the world, and now let’s bring the world closer together.”