Use your customer list to create Custom Audiences in Facebook

Adam Smartschan
Adam Smartschan / Published October 2, 2020

If you're a marketer, your prospect and customer list is one of your prized possessions. It's a tool for staying in touch. It's a way to nurture contacts into buyers. It's a great start for building audience personas.

Your list is everything.

With Facebook Custom Audiences, you can also use that list to serve up targeted advertisements. And if you do things right, your Facebook audience will automatically grow alongside your list.

What are Facebook Custom Audiences?

Facebook Custom Audiences let you target existing contacts and visitors for Facebook advertising. Facebook takes in the data you give it, then tries to match it to platform users. Those users can then see—and engage with—your ads. And Custom Audiences are part of Facebook Ads, so they don't cost you anything extra.

There are four types of Custom Audiences in Facebook:

In this post, we're focusing on the last one: Custom Audiences from a customer list.

Why should I use Facebook Custom Audiences?

Facebook Custom Audiences are about the easiest way to put a marketing message or offer in front of your list.

Sure, you can email them. But inboxes are jammed these days, and spam filters are getting pickier and pickier. Targeted Facebook Ads catch users where they're already spending their time.

And here's the cool part: you're not targeting just your list.

All types of Custom Audiences can be used to create Lookalike Audiences. With these, Facebook delivers ads to users who are similar to those in your Custom Audience. This is a powerful feature, since it puts your message in front of more folks who are like your existing buyers.

Quick pro-tip on lookalikes: don't base them on your entire list. There's going to be some junk there, and Facebook will base the lookalike on the wrong data. Instead, create a Custom Audience of only your best customers. Those are the people you want to reach.

How to upload your customer list to Facebook

To upload your list for use as a Custom Audience, head to Ads Manager, then click on Audiences on the left.

The Ads Manager section with the Audience tab on the left

From here, click Create a Custom Audience.

The Audience section with a Create a Custom Audience button

Finally, select Customer List as your source.

The Create a Custom Audience section with Customer List link

Now, you probably won't be able to simply export a .CSV from your CRM and upload it. The data—what Facebook calls "identifiers"—needs to be formatted correctly. For instance, the spreadsheet column containing contacts' first names must be called "fn." (Facebook offers a downloadable template with the correct formatting.)

Once your Custom Audience is in the system, you can choose it when you create a new Facebook Ads campaign.

The audience section showing where you can create a new audience or use a saved audience

Creating Lookalike Audiences on Facebook

Once your Custom Audience is created from your list, you can use it as the source of a Lookalike Audience.

Again, go to Ads Manager's Audience section, and this time click Create a Lookalike Audience. Pick your shiny new Custom Audience as the source. Then tell Facebook where you want your new targets to be located and how similar they should be to the folks on your list. You can also create multiple Lookalike Audiences with varying degrees of similarity.

Selecting audience location and size

Automatically update your Custom Audience

Custom Audiences from customer lists don't update themselves. Once a list is uploaded, that's your audience. Which isn't ideal if your customer list grows and evolves.

Instead of manually updating your Custom Audience, Zapier can automatically add an email address to your Custom Audience whenever it's added to your list—no matter where that list lives. Add people to your Custom Audience from form submissions, email marketing lists, CRM contact lists, databases, support tickets, online sales, and more.

Take a look at how it works, and then see how you can automate Facebook Custom Audiences with Zapier.


With Facebook Custom Audiences, you can immediately start advertising to new contacts, keeping your brand top of mind. Plus, lookalikes instantly find more potential prospects just like them.

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