Meta Business Help Centre
Create a lead form engagement custom audience

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- Go to Audiences.
- Choose the Create audience drop-down and select Custom audience.
- Select Lead form and then click Next.
- In the "Include" field, choose the type of form engagement that you want to use.
- In the "retention" field, enter the number of days that you want us to go back to collect engagement.
- Name your audience and add a description.
- When you've finished, select Create audience.
Note: If you've never created an audience before, you'll see a Create a custom audience button instead.
Note: If you tell us to go back 30 days and someone engaged 29 days ago, they'll be in your audience. However, if they fail to engage the next day, they'll then be removed from it. Anyone new who engages within the time period you choose will be added to the audience. This means that the audience is constantly being refreshed, so you don't need to edit or create a new engagement custom audience unless you want to change the time period or the type of engagement.
Your custom audience will appear in your list of All audiences. In the column Availability, you will see Populating until it is ready.
Note: Targeting options are limited for audiences that include people under the age of 18 in most countries, under 20 in Thailand and under 21 in Indonesia. Learn more about targeting options to reach teens and how this update may affect your ad sets.

Note: You can't create new ad sets with audiences based on Facebook Pages that have been deleted, and you can't use those audiences in other campaigns. This includes engagement custom audiences, associated lookalike Audiences, special ad audiences or saved audiences that include an engagement custom audience.
Learn how to review or update expiring audiences.