How to Use Facebook Lookalike Audiences to Scale Your Ecommerce Business

To scale any business it’s essential to bring new people into the sales funnel using prospecting ads.

These audiences of people that haven’t engaged with us before are called cold traffic, as opposed to our Facebook fans, leads, and customers which have already engaged with us and are referred to as warm traffic.

To select a cold audience to target, there are basically two methods.

The first is to use interests and demographics.

The second option is to use Facebook Lookalike Audiences.

And as these last ones often give the best results and are very quick to set up, today we’re going to explain how to create and get the most out of them.

What Are Facebook Lookalike Audiences?

There’s a very simple definition of a lookalike from Facebook:

A lookalike audience is a way to reach new people who are likely to be interested in your business because they’re similar to your best existing customers.”

So, you give Facebook a source audience (sometimes also called a seed audience) and Ads Manager will use all the available data to find common themes and from this create an audience of people will very similar characteristics.

When creating a lookalike you can choose the percentage, so a 1% lookalike will be the 1% of Facebook users in that country that most closely match the source audience.

That means you’ve instantly eliminated the 99% that are the least good match, instantly giving you a high performing audience to target.

Facebook Lookalike Audiences: Bonus Tip

When being used, a lookalike will dynamically update every 3 to 7 days, assuming the source audience it is based on is also dynamically updating such as audiences based on pixel events.

This saves a lot of time as you don’t have to keep creating new audiences for every new campaign.

Interests Based Targeting vs. Lookalikes Audiences

How accurate is the interest categorization that Facebook uses?

If you’d like to know, take a look at what interests Facebook has listed for you.

Go to the Settings menu for your own profile, then select Ads from the left-hand menu on your desktop and you’ll be presented with your own options for ads:

lookalike audience on facebook

Under “your interests” take a peek.

Some of the interests are highly accurate, for example, it understands that I work with Shopify and WordPress sites using my MacBook and Android phone while streaming music from Spotify with my Bose headphones…the stereotypical digital marketer!

Not everything is as accurate though. Remember, Facebook has been mainstream for 10 years and so a lot of data might be outdated or Ads Manager might be misinterpreting certain signals. For example, I use the Vivaldi web browser and Facebook has me listed as being interested in the music of classical composer Antonio Vivaldi.

antonio vivaldi

The guy in the portrait above is clearly NOT a web browser!

Similarly, Facebook thinks I’ve visited Canterbury, New Zealand when I actually took a day trip to Canterbury, UK which is only 11,000 miles apart. And if you check under the food section you’ll see it lists seafood and veganism together and raw food and barbeque.

Jon Loomer gives more examples in his blog post.

In conclusion, interest-based targeting can be highly accurate at times, but it can’t be relied upon 100% as interests can become outdated or categorization can be incorrect due to misinterpreting a single data point.

Creating Facebook Lookalike Audiences

One of the best things about using lookalikes is that they’re so quick to create.

In Business Manager go to the Audiences section, click the blue Create Audience button and select the Lookalike Audience option.

facebook lookalike audience create

Next, choose a source audience, the country, and percentage and hit the blue Create Audience button.

Congratulations, you’ve created a high-quality audience in under 10 seconds!

facebook lookalike audience creation

You can expand out the Advanced Options section to create up to six different percentage audiences at once.

As they are free to create, go ahead and create a range of audiences so that you have them to hand for future ad campaigns.

lookalike audiences

Facebook Lookalike Audiences: Bonus Tip

Once Facebook has been given a source audience, how does it decide who matches this audience?

We’ve asked Facebook and haven’t been given a definitive answer but from our discussions with Facebook and other information available, the signals they are likely to use include:

  • User behavior on Facebook and Facebook services, including activity in groups
  • Interests
  • Profile data such as age, gender, and location
  • Pages liked
  • Ads clicked on and pixel data

With the Facebook pixel on millions of websites, there is an endless amount of data on who signs up as a lead, who purchases, and even how much they spend.

Combine this with likes, comments, shares, videos viewed etc on Facebook plus demographic data and it’s possible that hundreds or thousands of data points go into making a lookalike, although we don’t know the exact formula that Facebook is using.

Value-Based Lookalikes Audiences

For eCommerce, we’ve previously covered how to create value based lookalikes by uploading a customer lifetime value file.

However, there’s a new type of value-based lookalike audience in town that is much better as it is based on data generated by the Purchase pixel event.

lookalaike audiences based on pixel event

These new value based purchase lookalikes have three advantages over standard purchase audiences:

  1. They separate out your best and worst customers by value. 
    For example, if you were Apple you might want to create an audience of people similar to those that purchase a $1,000 iPhone or iPad, not those buying a $20 cable.
  2. The recency of the data is taken into account. 
    Data from the last 60 days is analyzed with more weighting given to recent transactions.
  3. The frequency of purchases is another factor taken into consideration.

Previously we could create a source audience based on value OR recency OR frequency but never before have we been able to combine all three so easily.

So, for eCommerce use the new value-based lookalikes wherever possible.

Source Audiences

The minimum size for a source audience is 100, but keep in mind this doesn’t give Facebook much data to work with, so they recommend including between 1,000 and 50,000 people.

Quality is more important than quantity as the algorithm is looking to find similarities, therefore if you have enough people in your audience you might be able to segment it down to find a common theme.

For example, if you have a large email list, instead of including everybody in the source audience you could remove those that have been on the list for less than 3 months. Alternatively only include those that have opened one of our emails recently or have clicked on a link within the email.

People in your source audience will be excluded from your lookalike, unless you’re using a pixel as your source audience.

However, it’s easy to exclude the source audience in an adset so to be sure we separate our warm audiences from our cold audience lookalikes we always exclude the source audience when creating the adset.

Source Audiences Options

A whole range of pixel events and custom audiences can be used as a source audience for a lookalike.

These include but aren’t limited to:


  • Value audience based on the purchase pixel, as covered above
  • Customer lifetime value file
  • Offline event set
  • A product set from a product catalog
  • Purchase pixel event
  • Purchases over $xx
  • Purchases with a customer frequency over x times
  • Initiate checkout pixel event
  • Add to cart pixel event
  • View content pixel event

  • Website visitors
  • Lead pixel event
  • Top 5%, 10% or 25% of website visitors based on time spent on site

  • Email data file
  • Facebook fans
  • Video views
  • App activity
  • Facebook page engagement
  • Instagram page engagement
  • Event responses
  • Lead form responses
  • Instant experiences

Always aim for a source audience that most closely matches your end goal.

For example, if your aim is lead generation, consider using an audience of lead pixel fires, an email custom audience or lead form completions.

You can use more than one lookalike in an adset if you wanted to increase the audience size while still maintaining quality.

Getting Started With a New Facebook Ad Account

If you’re just starting out with a new account there’s a high chance that you don’t have the 100 purchases necessary to create a lookalike, and you certainly won’t have the minimum of 1,000 that is recommended.

So, start lower down the funnel and work your way up to better source audiences as you scale.

If you have an established brand but haven’t been doing eCommerce yet, you can use a source audience of Facebook fans or leads.

If your business is completely new then you can start by running a video views campaign to a broad audience and building an audience of video viewers.

From this create a lookalike and run traffic to the website to start feeding your funnel.

Your source audiences as you move up the funnel could be:

10-second video views
Website visitors
View content
Add to cart
Initiate checkout

Facebook Lookalike Audiences for Different Countries And Regions

If you are expanding your business into new territories you can create a lookalike for the new region based on data from an existing country that you have data for. This can be really useful as a starting point when you don’t know what interests to target in the new country. Naturally, once you get enough leads or sales in the new country you can switch to using that data for a more accurate lookalike.

You can also combine several countries in one lookalike audience. When doing so you’ll see an information panel letting you know that one country may have an audience that is proportionately larger than the others:

lookalike audience region based

There’s also an option to create a lookalike for a region:

lookalike audience region based selection

Perhaps you want to target all countries in the EEA (European Economic Area), one click is all it takes to include all the countries.

lookalike audience country based

What Facebook Lookalike Audience Percentage Is Best?

The most common question we get asked about lookalike strategy is “what percentage should I use?”.

Beware any answer giving an exact percentage unless you know what country they’re referring to.

A 1% lookalike for the US contains 2,150,000 people but in Denmark, the same 1% is just 39,700 people.

As a starting point, we’re often aiming for around 1-2 million in our cold traffic audience, assuming we’re covering the whole country and not just a city.

So, for the US start at 1%, for the UK perhaps 3% and 5% for Canada and Australia.

Facebook Lookalike Audiences: Bonus Tip

As your ad spend increases you will start to saturate your original lookalike audiences, so over time move up to the larger percentages or switch to a different source audience.

In theory, a lookalike shouldn’t need any age, gender or interest restrictions as Facebook is already taking this into account.

However, it’s still worth testing some layering, for example in the US a 10% lookalike (21.5 million people) combined with your top 6 interests to create an audience of 1 million can be super powerful.


Traditionally, creating cold audiences was a lot like a hipster brewing coffee: it was a time-consuming process with each artisanal, handcrafted audience taking a lot of research to find just the right combination of interests, locations, age, gender, and other demographics.

Now, we can often get a better result using a lookalike audience that takes just a few seconds to create and has the advantage of dynamically updating.

There can occasionally be drawbacks to using Facebook Lookalike Audiences, the main one being that Facebook doesn’t understand what your business or product range is, all it can look at is the data points it receives.

However, for most clients, we see excellent results and use lookalike audiences around 60% of the time for cold traffic and interest-based audiences the other 40% of the time.

It does vary from business to business so always test both approaches to discover what works best for you.

Also read: How to reach smartphone users through your Ecommerce business?