You can create five types of Facebook Custom Audiences: Website Custom Audiences, App Activity Custom Audience, Customer List Custom Audience, Offline Activity Custom Audience, and Engagement Custom Audiences. The latter can be subdivided into eight more categories: Video, Lead form, Instant Experience, Shopping, Instagram account, Events, Facebook Page, and On-Facebook Listings. So, in total, there are twelve types of Custom Audiences you can use in your ad campaigns.