Facebook customizes its ads based on what you want to see. Advertising accounts for the majority of Facebook’s revenue. It’s controversial to some, because people don’t think that they should be paying to advertise on Facebook. But the ads are what keep Facebook as we know it free.
Advertising on Facebook, using Facebook on websites (like button), using Facebook to access social graphs on mobile apps (less usernames and passwords) and building apps on Facebook. Facebook makes most of its money off ads, and in turn these ads keep Facebook free.
Paying to promote these services not only helps to keep Facebook free but also helps you reach people who aren’t connected to your page yet. You can choose how much you want to pay and how many users you will reach. You can decide which posts to promote. It helps users increase their reach.
Many people are opposed to paying for adds and posts on Facebook. But many users don’t know the benefits of it.