As of the first quarter of 2016, Facebook has 1.65 billion monthly active users. It’s a massive audience, which means that most of them probably won’t see your posts. The only way to guarantee that your desired audience sees your posts is to use Facebook Ads.
Boosting your post is an easy way to reach more people. When you boost your post it will appear higher in your audience’s News Feed and be seen by users who haven’t yet liked your page.