The most common type of audience or targeting on Facebook is interest-based targeting. Most event marketers are familiar with this. In fact, you probably use interest-based targeting numerous times when you create campaigns: If you press ‘Boost’ on your Facebook page and are prompted to input a handful of interests, that’s interest-based targeting. If you use Facebook’s guided campaign creation interface or edit a live ad set, interest-based targeting is what’s behind the section that prompts you to add demographics, interests, or behaviors. Those interests—i.e., an artist, a brand, a celebrity—impact the number of individuals that you're reaching.