Custom Audiences
By the AdFlint research team · Last reviewed July 2026
Meta audiences built from data you already own or activity people generated on Meta, such as site visitors, customer lists, app users, or video viewers.
You create them in Ads Manager from a source - pixel or Conversions API events, an uploaded list, app activity, or on-platform engagement - then target or exclude them in any ad set. They power both retargeting and lookalike seeds. Most accounts under-use exclusions, retargeting existing customers alongside prospects, and forget that website-based sources expire on whatever retention window was set.
Custom Audiences compared with
The settings this gets confused with, and how to tell them apart.
You should not need to know this to advertise.
AdFlint handles the settings for you, inside the Google and Meta accounts you already own.
Try AdFlint free