Facebook celebrated its twelfth birthday on Thursday, and in the twelve years that it’s been around, the social network has managed to accumulate more than 1.5 billion users. To be fair, a significant chunk of those users aren’t actually active on Facebook, but that doesn’t detract from the fact that about a fifth of the world’s population has a Facebook account. As impressive as that is, however, CEO Mark Zuckerberg believes that it’s only the beginning. According to him, Facebook is going to add 3.5 billion users over the next fourteen years, for a total of 5 billion by 2030. In order to do this, the company needs to help people in developing nations connect to the Internet, which is why it’s been investing in projects to increase Internet access in these areas, though not all of the projects have been well-received.