Sometimes you want your audience to DO something. Like for example click on a link to register for an event. Well, tests have shown that people are more likely to click on a Call-to-Action button than on a link or URL. Integrating a Call-to-Action button in a Facebook Post can definitely help you to get more clicks, and not many people know this but it is possible! Facebook offers a range of predefined Call-to-Action buttons for posts containing a link.