Meta Ads
Custom Audiences
Custom audiences are Meta targeting segments built from your own data, including customer lists, website visitors, app users, video viewers, and people who engaged with your Page or Instagram profile.
In practice
Custom audiences are the raw material for remarketing, exclusions, and lookalike seeds on Meta. Website custom audiences come from pixel and CAPI events, so they inherit whatever tracking gaps you have. Customer list audiences are uploaded, hashed, and matched to Meta accounts; match rates depend on how complete the email and phone data is. Engagement audiences are built from video views, lead form opens, and profile interactions and require no tracking at all.
The practical uses: exclude existing customers from prospecting so budget finds new buyers, sequence remarketing by how far someone got (viewed product, added to cart, initiated checkout), and seed lookalikes from the highest-value segment.
Naming and retention windows matter. A 180-day website audience and a 7-day cart abandoner audience are different tools, and a shared account with fifty unnamed audiences is unmanageable.
Why it matters
They are how first-party data becomes targeting and exclusion on Meta.
RELATED TERMS
Lookalike Audiences
A lookalike audience is a Meta targeting segment of people who share characteristics with a source audience you provide, such as purchasers, high-value customers, or engaged website visitors.
Remarketing (Retargeting)
Remarketing is advertising to people who have already interacted with your business, such as site visitors, product viewers, cart abandoners, or past customers, using lists built from tracking and first-party data.
Customer Match
Customer Match is a Google Ads feature that lets you upload hashed first-party customer data (emails, phone numbers, addresses) to build audiences for targeting, exclusion, bid adjustment, and as signals for automated campaigns.
Written by Ilya Bulychev, Founder, Live PPC Ads. Part of the PPC Glossary.
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