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December 11, 2019 By Toby

Lower Facebook Ad Costs, Improve Results Via Lookalike and Split Testing

Facebook Lookalike Split Test Blog Post

Facebook’s ad platform is driven by intelligent algorithms that can deliver highly profitable ad results. Facebook has a ton of native data that it draws on readily to help your ad campaigns get off to a strong start and deliver the results you need.

But there are things you can do right now to accelerate and greatly improve Facebook ad results that lead to the following:

  • Significantly Lower your cost per result (whether that’s lower cost per lead, lower cost per click, or less expensive video engagements)
  • Extend the mileage of your budget so you can reach more people and drive more results
  • Get your ad campaign off to a stronger start more quickly

How can you do this?

Facebook Lookalike audiences.

In this post I’ll share the results of four different split tests using Lookalikes vs non-Lookalike targeting with a Facebook ad campaign. Two of these split tests produced a lower cost per lead, and two did not.

For you as an advertiser, run your own tests and you will likely uncover improved results. But as always…test, your mileage will vary. The bottom line is, Facebook makes it very easy to run a statistically valid split test automatically so you should be leveraging that feature.

What Are Lookalike Audiences?
Lookalike audiences are audiences of Facebook profiles that are similar to and based on an existing audience.

An existing audience could be a customer email list you have or an audience defined as those that have interacted with a video on Facebook from a prior ad, or visited your website, for example. Facebook refers to these lists as a Custom Audiences.

So, your Lookalike audience is based on a Custom Audience that you create or define. You then tell Facebook to use this Custom Audience to find potential customers and prospects that match the profiles, interests, and behaviors from the seeded Custom Audience list you created.

With a Custom Audience, you’re giving Facebook a big hint at what to go look for when it creates a Lookalike audience.

You can create Custom Audiences based on many different behaviors.

For example, A Custom Audience can be created based on visits to your website or even just specific page URLs on your website  – here’s how that looks inside Facebook’s ad manager:

Facebook Custom Audience Past Website Visitors
Creating A Facebook Custom Audience Based On Past Website Visitors

With website visits, you can create your audience of all website traffic or just specific page URLs and specify the duration people will stay on the list up to 180 days.

Here’s another example of a Custom Audience based on engagement with any videos you’ve promoted – watched 25% of your video, 50%, 75%, etc. The possibilities here for marketers are endless.

Facebook Custom Audience Video Engagement
Creating A Facebook Custom Audience Based On Video Engagement

And here’s the full list inside Facebook of Custom Audiences you can create.

Complete List Facebook Custom Audiences
Complete List Of Facebook Custom Audiences

Once your Custom Audience is created, you then create your Lookalike audience – here’s what that looks like in Facebook. Under “Select Your Lookalike Source” is where you would add your newly created Custom Audience.

Creating Facebook Lookalike Audience
Creating Facebook Lookalike Audience

Once your Lookalike has been created you can then utilize it in your latest ad campaign.

But for this post, I am focusing on using Custom Audiences to create Lookalikes to help with your lead generation and prospecting Facebook campaigns.

The quality and source of your Custom Audience is the most crucial factor in creating a lookalike audience that will deliver results. Garbage into the list and garbage out for the Lookalike.

For the case study results below, we used a list of actual current customers and past Facebook leads that expressed interest in past offers. This type of a list is perfect for creating a Custom Audience that can be used to create a Lookalike after all these are people we know who are already customers and spend money with the brand or have expressed interest in an offer.

The campaigns we ran were Lead Ads designed to capture lead information (i.e. name, email, and phone number) in response to a limited time offer (LTO).

The Seed Lists Used To Create The Lookalike

The seed list used to create the Custom Audience that was used for the Lookalike was comprised of a national list of past customers and Facebook and Google leads we had recently collected – the list size was 45,853. This list was loaded into Facebook as a Custom Audience which was used to create our Lookalike audience.

Creating The Split Test

Once you start building your campaign or at the ad set level, you’ll have the option to create your split test. Facebook gives you options in terms of what to test – in this case, we chose Audience.

We split test our Lookalike audience that we created with our normal interest and demographic targeting that had proven to work well for the last 30 ad accounts we used it in.

Creating Facebook Ad Split Test
Creating Facebook Ad Split Test

Results of The Lookalike Split Test

Our campaign objective for the four split tests was using Facebook’s Lead Generation campaign objective – we ran Lead Ads to capture leads of potential prospects right in Facebook that were opting into a special offer. The business was a retail brick-and-mortar service business.

The first two tests showed good improvements with the Tampa split test lowering the cost per lead the most at close to 50%. The two other markets – Charlotte and Tulsa – showed higher cost per lead results with the Lookalike audience.

We tried to keep all other variables like creative and messaging the same in the split test to remove variances.

Results Facebook Split Tests Lookalike Audience
Results of Facebook Split Tests Using Lookalike Audience

The bottom line is that your mileage will vary. These split tests are easy to run and cost almost nothing in terms of your effort to run them – so test the results and you likely will deliver far better results with your Lookalike audience.

Facebook will also tell you the results of the test – below is an example – it let us know that there was an 84% chance we’d get the same winner again with the same settings.

Facebook Split Test Message
Facebook Split Test Message

Some Common Questions:

How big of a seed list do you need to create a Lookalike?

A Quora “evangelist” states you need a seed list of between 1,000 – 50,000 but can be as little as 100. You need the largest list you can create…more data points will help Facebook’s algorithm work.

How do I know when to stop the split test?

Facebook will tell you – it will give you percentage likelihood that if you ran the test again that you would see the same results. It’s up to you when to stop the test – in our case we stopped the split test when we had 70% or higher that the same results would occur again.

Practical Uses and When Would You Want To Use Lookalikes?

If you have past customer lists or past customer data like website visits that you have captured using Facebook’s pixel that you know are valuable past customers, absolutely you need to test these Custom Audience lists with Lookalike campaigns…those lists are a data goldmine for your company.

If you’re a restaurant and capture emails from free wifi logins, a dentist with a patient list, plumbers, beauty products and retail companies, contractors or home remodelers…anyone with a customer list. Start testing these lists by creating Lookalikes and improve your campaign results.

Related Posts:
Are Facebook Boost Posts Worth It?
Facebook Ads vs Boosted Posts – Differences, Which Is Better?

Filed Under: Facebook Ads

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