Boosting Facebook posts to custom audiences is a great way to reach a targeted audience (and at a relatively low cost). Many people running Facebook pages don’t realize this, but you don’t have to boost a post simply to your fanbase. Instead, you can boost a post to any custom audience you have set up in Facebook. That includes people on your email list, people that have visited your website, and any lookalike audiences you have created. That’s where the true power lies. By boosting to a custom audience, you are getting in front of people that already know of