Most indie authors start with Amazon Ads because the logic feels airtight: advertise books where people buy books. But according to veteran digital advertiser David Gaughran, who has worked in digital advertising for over twenty years, BookBub Ads may actually be the most responsive and consistent ad platform available to authors — once you clear the initial learning curve. That gap between where authors start and where they should eventually focus is where thousands of ad dollars quietly evaporate. If you've been publishing for one to three years and you're ready to move past guesswork, here's the framework I'd recommend for choosing your platform and knowing when it's time to scale.
Let's get the hard truth out of the way first: books are a uniquely difficult product to advertise. Unlike a kitchen gadget or a pair of running shoes, a book's appeal is deeply subjective, genre-dependent, and almost impossible to convey in a single image or headline. This is something that surprises even professional marketers who cross over into publishing. Each of the three major platforms — Amazon Ads, Facebook Ads, and BookBub Ads — handles this challenge differently, and the right starting point depends not on which platform is "best" in the abstract but on where your catalog is right now and how much you can afford to learn with.
If you have fewer than three books published, start with Amazon Ads. The reasoning is simple: Amazon Ads operate closest to the point of purchase, your targeting options are built around reader behavior (keywords, comparable authors, categories), and you can start with very small daily budgets. The feedback loop is tight — you can see which keywords convert and which don't within days. But here's the critical rule Gaughran emphasizes that too many authors ignore: don't spend what you can't afford. Treat your early ad budget like a gambler's bankroll. Never borrow money for a campaign. The pressure of debt will push you into bad decisions — overbidding, refusing to kill underperforming ads, scaling before you have data. Set a hard monthly ceiling, learn the mechanics, and accept that your first campaigns are tuition, not revenue.
Once you have a backlist of three or more books and you've learned to read your Amazon Ads dashboard without flinching, it's time to layer in Facebook Ads. Facebook's strength is top-of-funnel discovery — reaching readers who don't yet know they want your book. The targeting is broader (interests, demographics, lookalike audiences), and the creative demands are higher. You need compelling images and sharp copy that stops a scroll. Facebook is where you build awareness and drive readers into your ecosystem — your mailing list, your series page, your brand. It's also more expensive to learn on, which is why I don't recommend it as a first platform. But for authors with enough titles to make a new reader economically valuable over time, Facebook becomes essential for growth.
Here's where things get interesting. BookBub Ads is the only major ad platform at this scale composed exclusively of readers — over ten million verified book buyers. That distinction matters enormously. On Amazon, you're competing with every product on earth for attention. On Facebook, you're interrupting people who came to argue with their cousins. On BookBub, every single person seeing your ad chose to be in a book-discovery environment. Gaughran has reported that the amount of money he can spend effectively on BookBub — meaning with an immediate return on investment — quadrupled in a single twelve-month period. The platform can be unusual for those accustomed to Facebook or Amazon, and many authors struggle to get over that first hump. But the conversion potential, once you understand BookBub's creative and targeting conventions, is unmatched. I'd recommend introducing BookBub Ads once your Amazon campaigns are profitable and your Facebook campaigns are at least breaking even. That's your signal that your covers, blurbs, and pricing are working — and BookBub will amplify what's already converting.
The mistake most authors make isn't choosing the wrong platform. It's scaling before they have proof that their foundation works. A brilliant ad campaign cannot save a weak cover, a flat blurb, or a book priced wrong for its genre. So here's your one concrete action: before you spend another dollar on any platform, run a five-day, five-dollar-per-day Amazon Ads campaign targeting three of your closest comp authors. If your click-through rate is above 0.3% and your orders are covering at least half your spend, your packaging is working and you have something worth scaling. If not, fix the foundation first. The ads will be waiting.