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Book Marketing: How To Optimise Facebook Adverts – A Case Study

Book Marketing: How to Optimise Facebook Adverts – A Case Study

cover of Love's Long Road by G D HarperOver the last few months there have been numerous ALLi discussion threads on the merits and demerits of Facebook advertising, and the sharing of what authors have found that works and doesn’t work. In this post, Scottish novelist G D Harper generously shares his detailed and meticulously analysed findings from the campaign he has been using to promote his debut novel Love's Long Road.


My formula for optimising Facebook advertising is to think about an effective campaign as having the right ad link to the right sales page, with the right target audience seeing the ad the right number of times, and with the book at the right price and advertised at the right cost to deliver the right result. This allows me to separate out and quantify the main factors that affect sales, identify what the weak points are, and then know if I have fixed them. The data that I’ll quote in this blog can be found, when a campaign is running, in Facebook’s ‘Manage Ads’ function, which is in the drop down from the inverted triangle in the top right corner of the Facebook Home page.

The Right Ad

The ad needs to be an engaging and persuasive. Although this is a bit like stating the obvious, it’s something that I managed to overlook at the beginning of my marketing, or rather it’s something I convinced myself I had achieved when in fact I hadn’t.

My first ad was a stock visual of an iconic building in Glasgow, the main setting of the book, along with a straightforward sales pitch, ‘Loves Long Road by GD Harper. A psychological thriller set in 1970s Britain, now on special offer at Amazon for 99p’. It got almost no CTR (click through rate) until I found a way to better engage people, by adding the opening line of my book ‘Should you be at someone’s funeral if they died because of you?’. Including this line in my copy moved my Facebook relevance score from 3 to 7 and I finally had a viable CTR of 3.2%.

I then reworked my visual, replacing my not very impactful stock photograph with a new visual featuring the design elements from the book’s front cover, along with different quotes from book reviewers. Here’s one example.

sample FB ad

I tested ten ads using ten different quotes and there was a marked difference on CTR depending on what quote I used. Everyone’s quotes for their books will be different, but there were some general guidelines I learned from the testing.

If I wanted to use a quote about character or setting, then it is definitely a case of ‘show, don’t tell’. My book is set the 1970s and the quote ‘From wearing bright yellow jumpsuits to drinking Blue Nun, the detail was perfectperformed much better than ‘The late 1970s comes alive’. With the benefit of hindsight I realised the latter quote was telling people how great the setting was, the former was giving them an example so they could judge for themselves.

If I wanted to use a quote about story or plot, then specific was better than general. Quotes like ‘an excellent read’; ‘a real page turner’; ‘couldn’t put it down’ all fared less well than descriptors that gave a distinctive sense of what the book was like. My top performing quote was ‘Intelligent, thoughtful and compassionate’ followed by ‘Full of drama and intrigue, with hits of humour and sensuality’ which I think illustrates the point well. The CTR of the best performing quotes was three times better than the least impactful ones.

As an aside, I found I could incorporate all these quotes into my ad visual along with my book title and still be below Facebook’s rule that text has to cover less than twenty percent of the ad.

Going forward, I have set myself a hurdle that an ad has to have a greater than 2.5% CTR at the start of a small (£20-40 budget) pre-test, otherwise I won’t use it for a main campaign.

The Right Sales Page

Again, when I first launched my book I was in a hurry for sales and started adverting almost straight away. What I found was that if I did manage to get people to visit my Amazon sales page from promotions in the first months after launch, the conversion to sales was very low. It is only now, nine months after the launch when I have over twenty reviews with an average rating of 4.7 on amazon.co.uk, that I’ve finally got an Amazon page that works to turn visits into leads. I’ve decided that for my next book I won’t run any paid-for ad linking to my Amazon page until I have at least ten reviews and an average ranking above 4.0. If I get anything below that, I don’t think the web page sales conversion will be high enough to justify paid advertising.

The Right Target Audience

I selected my target audiences by running small tests comparing one bundle of target audience definitions to another, to determine what the ideal combination of demographic, psychographic and lifestyle preferences was for the target audience of my book. I ended up with two target audiences, a narrow one which was very cost efficient as they were the core readers of my book, and a broad one which was not as perfect a fit with my readership, but was a much bigger absolute number of potential readers. I used the ‘Audiences’ tool in Ads Manager (which can be found in the top left ‘Facebook Ads’ feature when in Ads Manager) to check the duplication of different target audiences. If it was above ten percent, then I excluded people who were in one target audience from the other target audience.

The narrow target audience campaign achieved higher CTR, higher relevance scores and lower cost per click (CPC) and gave the better ROI (return on investment). My broad target audience campaign had a lower ROI and took up more of the overall budget, but gave higher absolute sales which pushed me up the Amazon charts to generate more post-campaign sales due to discoverability and word of mouth. I chose a mix of 2:1 broad target audience clicks to narrow target audience clicks as I was prioritising achieving the highest possible ranking at the expense of best possible ROI, because I wanted the social proof of the book being a top 500 best-seller. In future I will have a different objective, to maximise ROI, so I’ll have a lower budget per campaign and most, if not all, the budget will be spent against the narrow target audience.

The Right Number of Times

There are lots of advertising theories about how many times someone needs to see an ad for it to be effective and the theory which I like the best is…’it depends’. If you have a complex message or you’re asking people to make a significant purchase or decision you need high frequency. A simple message and/or a low risk purchase needs only a low frequency.

An eBook on price promotion at 99p I think definitely falls into the latter category and so I try to plan my campaigns to maximise reach and minimise frequency. The total number of impressions a campaign achieves is the reach (the number of different people seeing the ad) time the average frequency, so, in a simple example, a thousand impressions could be a thousand people seeing it once or five hundred people seeing it twice. If I only cared about reach, this first campaign would be twice as effective as the second.

There was a direct correlation between the average frequency number and CTR in the Facebook Ads Manager reports. As the average frequency went up, the CTR went down as you can see in the table below. Lower CTR means higher CPC and lower relevance scores.

 Day 1Day 2Day 3Day 4
Ave Frequency1.

If my campaign was becoming less effective over time I checked to see if this could be the explanation. If it was, I would change target audience, stop for a while or change creative.

This effect of frequency on CTR is the reason for me having both a narrow and broad target audience. My narrow target audience campaign was great while it lasted, but as the campaign went on the ad started being seen more and more by the same people again, increasing average frequency so the CTR dropped to the point where it ceased to be effective. But once this campaign had burned itself out, I still had the broad target audience campaign to reach the sales numbers I wanted to achieve. It never had the effectiveness of the narrow target audience campaign but it could keep going longer.  In other words, each pound spent on a small campaign is always going to be more effective than a pound spent on a big campaign because the bigger the campaign, the higher the average frequency and the more broad target audience bought.

The Right Price

There are two schools of thought as to how to price a book for a Facebook promotion. Adam Croft commented in a recent ALLi thread that for him the best way was to price high, £2.99 or above, so he recovered his advertising costs and made a profit. Sadly, what I found in my case is that I need to price low and accept the loss as an investment in the future. At 99p every five people who visited my Amazon page bought the book, at £1.99 it was one in twelve, and at £2.99 it was one in twenty. Add to this the lower CTR and therefore higher CPC of the higher price campaigns and for me the best scenario was to advertise only KDP Select 99p price promotions.

My conclusion on pricing is that the high price route is best if you are a well-known author with a strong reputation and a huge fan base. Like Adam Croft, for example! For the rest of us, we just have to suck up the losses until we get there.

The Right Cost

High click rates, relevant ads and optimal targeting all contribute to keeping the CPC down. However, there is one further metric I analyse to keep advertising costs as low as possible, the often-overlooked cost per reach (CRR).

CRR is affected by the supply-demand equation for Facebook ads at any given point in time, and also what choices made when setting up ads in Ads Manager or Power Editor. Media costs are seasonal and inflationary, so if I advertise in the lead up to Christmas, for example, I will have a higher CRR. If Facebook ads become more popular with advertisers, there will be high inflationary pressure on costs the next time I go to advertise. So I could be doing everything right in terms of the factors I can control and still find my cost per sale going up. If I didn’t check this number and see its effect, I run the risk of deciding my latest ad wasn’t as effective as previous ones, when in fact it was external factors to blame.

There are, however, some things that can be controlled regarding CRR. Where an ad is placed, what devices it is allowed on, what time of the day or day of the week it will run all affect CRR. For example, I might conclude people are less likely to shop on a mobile phone and tablet and therefore exclude them and make the campaign desktop only, but this will dramatically increase the CRR and therefore the CPC. I’m not saying there shouldn’t be restrictions on where a campaign is placed, but the CRR impact should be checked to see if the restriction is really worth it.

Also some target audience have higher CRR than others.  A target audience consisting of people who read similar authors and books to mine had a CRR of £19.50, whereas a target audience of people who read crime fiction had a CRR of £9.44. That means the similar-authors-and-books target audience has to generate a much higher CTR than the crime-fiction one to reach the same CPC.

The Right Result

Finally, to give the bottom line on how my book, Love’s Long Road, fared using these techniques. I ran my first campaign in November 2016 and reached the top 1000 in the overall Amazon paid-for ranking which I think was already a good result. My fully optimised campaign ran at the end of February and this time I reached number 331 in overall paid-for Ebook sales on Amazon UK, selling over 500 EBooks in the seven-day promotional window and having over 4000 page reads in Kindle Unlimited, a far cry from the two or three EBooks a week I was selling before Facebook advertising.

Good luck with your advertising, I hope you found this useful.

OVER TO YOU If you have any top tips to add to G D Harper's very helpful account, we'd love to hear them – join the conversation via the comments box.

Terrific case study of an indie author's #Facebook ad campaign by @Harper_Author Click To Tweet



Author: GD Harper

GD Harper is a Lightship prize-winning Scottish novelist, author of the psychological thriller 'Love's Long Road'. Find out more at his website www.gdharper.com.


This Post Has 22 Comments
  1. Thanks for all the great advice!
    I have designed 10 ads for my novel as per your instructions. Should I post them one at a time? And how much of a budget should I set for each ad? And how many days should it run?

    1. Yes, post them one at a time, that way you can see results of each one separately. I find you need minimal budget (GBP/USD 20-30) to get a good indication of what results you are going to get. After I spent this amount of money, if I increase budgets the effectiveness numbers very rarely shift, although CPM increases as you move to more expensive readers. I also find it’s better to concentrate the ads into as fewer days as you feel comfortable with, as this generates more unique reach than budget spread out over a longer period of time.

  2. Thanks for sharing GD!
    Can you, or anybody else who has done this, share where did you send the traffic from FB?
    Did you send it directly to Amazon product page?
    Or did you go via your own sales page or landing page for mailing list subscription?
    If you sent the traffic to Amazon directly how did you measure the results of different ad sets?
    And how could you separate them from organic traffic?
    Is using Amazon Associates still a viable option to help with tracking?


    1. Hi Shay
      I send my traffic to my Amazon sales page and track sales results by only running one ad set at any time. The spike in sales is immediate (and transitory) so it’s pretty easy to work out what is promotional sales and what is organic.
      If you use Amazon affiliates you can insert a piece of code into the link to the Amazon page that identifies which ad set or even which individual ad generated that link click and even if it resulted in a sale. However, having an affiliate link in a Facebook ad may be in breach of Amazon affiliates terms and conditions as you are sending the reader to Amazon from a site (Facebook) that you don’t control. So if you wanted to be completely safe using this technique you should have the link take the reader to your website or mailing list sign up from where they can then click through to Amazon, then you will definitely be in compliance.

  3. Awesome tips! It looks like for Facebook ads, if you front-load the work to make your ad creative as engaging as possible it will pay off in the long run by being engaged more thus having a lower CPC and cost-per-conversion.

    I recently noticed that whenever a new FB ad format comes out it is engaged much more than existing ad formats, which translates into a lower cost-per-result. I spoke to a FB customer support specialist and asked why this was and they said it’s because new ad formats have much less competition amongst competitors using that same, new ad format, thus the cost-per-reach is lower.

    For FB advertisers I suggest putting in work with your ad visuals and copy and not being afraid to test new ad formats!

  4. Not meaning to “pitchfork your child,” but . . . it would be truly interesting to view the results if you could have tested 3 different names for your book. I think this name is . . . well, unmemorable at best. We all KNOW that cover art can be crucial. But a “killer name” can do a heckuva lot, too. And you’ve been so diligent and attentive to so many other aspects of your marketing. Yet (as my granny used to say), I’d bet you dollars-to-donuts, that a different tile could well have garnered more sales improvement than ANY of the other items you labored over. (And you could STILL try it — that’s one of the marvels of modern-day self-publishing.)

  5. Great study. I’m doing Mark Dawson’s course and am about to begin work on my first ads, but I’ve also realised I have to put in way more work on getting the fundamentals right–especially pricing and positioning the book toward the right audience. Plus you really do have to spend money on figuring out what works for you, and since my audience is entirely different from yours, from Mark’s, from just about anyone else’s, there’s no way I can shortcut this step.

    My top tip would be: analyse the market. I just did a study of the top 10 bestsellers in the Amazon sub-categories where my books rank, and learned more actionable info from a couple of days’ work than I would have believed possible. Since everyone’s books rank differently, this is another thing that you can’t shortcut.

    1. Hi Jane, can you please assist other writers with a little more specifics on exactly how and what steps you took to research these top 10 and what exactly you were looking for?

      Thank you,

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