You can create a Custom Audience based on the people who already have interactions with your online store, whether it's inside or outside of Facebook.

Here are four ways to create a Custom Audience:

If you want to build your Custom Audience, here are helpful links based on:

a. Customer File - If you have a list of your customer's email addresses, phone numbers, or newsletter subscribers, you can import the hashed customer list to Facebook. Then, the hashed data will be matched to the people on Facebook.

b. Website Traffic - You can remarket to your website visitors using Facebook Pixel. It helps you create a Custom Audience based on the people who visited your website.

c. App Activity - If you have a mobile app, you can use your app users as your Custom Audience.

d. Engagement - You can create a Custom Audience based on the people who have previously interacted with your content on Facebook or Instagram.