You can use Facebook’s carousel ads to tell a brief story about your product’s benefits. Each ad can be an image rather than a product, with text in the image telling bits of the story you want to tell. i.e. - Card 1: “We built the ultimate secure group messaging app.” Card 2: “You + your friends, all in one place.” Card 3: “Best in class end-to-end encryption.” Each card can contain a “Sign Up” CTA to drive clicks.