New Facebook Custom Audience Option.
Facebook has added a new Custom Audience option base on Facebook and Instagram shopping interactions.
I'm going to walk you through how to create your own Custom Audience through the Facebook Ads Manager.
Inside of your Facebook Ads Manager, access your Audiences, then choose Create Audience and Custom Audience from the drop down.
Under Use Facebook Sources, choose Shopping and you will see three new options to create custom audiences for your ad retargeting.
• People who viewed products
• People who added any products to their basket
• People who purchased any products
I'd suggest creating audiences based on the past 3, 14 and 21 days for your retargeting.