META ADS · CUSTOM AUDIENCES AND LOOKALIKE AUDIENCES
Meta Custom Audiences — First-party data and algorithmic reach
According to Meta documentation, Custom Audiences enable targeting people based on your own data: website visitors via the Pixel, customer lists via file upload, and app activity. Lookalike Audiences extend reach to users with a similar profile to your existing audience.
BOOK A STRATEGY CALLInterest targeting without Custom Audiences does not deliver qualified demand
Relying exclusively on interest- or demographic-based targeting reaches users without demonstrated purchase intent. Custom Audiences from first-party data — website visitors, customer lists, app activity — enable more precise targeting. Lookalike Audiences extend this to similar user profiles without losing the connection to your own data foundation.
Three Custom Audience types and Lookalike extension — used in a structured way
According to Meta documentation, there are three main Custom Audience types: Customer File (hashed data such as email, phone, date of birth), Website Custom Audiences (from Pixel events), and App Activity (from in-app interactions). Lookalike Audiences require a source audience of at least 100 people and take 1 to 6 hours to fully populate according to documentation.
AUDIENCE TYPES IN META ADS
Custom Audiences and Lookalike Audiences
CUSTOMER FILE
According to Meta documentation, hashed customer data can be uploaded: email addresses, phone numbers, names, dates of birth, gender, location or mobile advertising IDs. Up to 10,000 records can be processed per upload batch. An account can contain up to 500 standard data file Custom Audiences.
WEBSITE AUDIENCES
According to Meta documentation, up to 10,000 Website Custom Audiences can be created per account. They are based on Pixel events and segment visitors by pages visited, actions taken, and time periods. A correctly installed Meta Pixel is required.
APP ACTIVITY
Custom Audiences from app activity are based, according to Meta documentation, on App User IDs and app engagement data. An account can contain up to 200 Mobile App Custom Audiences. Integration of the Meta SDK into the app is required.
LOOKALIKE AUDIENCES
According to Meta documentation, Lookalike Audiences require a source audience of at least 100 people — or at least 100 unique conversions (200+ recommended). The size range runs from 1% (highest similarity) to 20% (greatest reach) in 1% increments. According to documentation, population takes 1 to 6 hours.
WHY AIM
A Lookalike built on poor source data is a Lookalike aimed at nothing
The quality of a Lookalike Audience depends directly on the quality of the source audience. A customer list with poor data hygiene or a website audience without proper event segmentation produces Lookalikes that don't match the target customer profile. AIM structures Custom Audiences by data source, segmentation logic and campaign goal — before Lookalikes are created.
When Custom and Lookalike Audiences deliver the most leverage
- CRM data available and exportable as a file
- Website traffic with correctly installed Pixel
- Retargeting campaigns based on visit history
- Lookalike from existing customer list (min. 100 people)
- Lookalike from conversion data (min. 100 conversions)
- Scaling to new audiences without interest targeting
- App users as source audience for mobile campaigns
- Separation of cold and warm audiences in campaign structure
- Suppression of existing customers from prospecting campaigns
Precise targeting starts with clean first-party data
We analyze your existing audience sources, structure Custom Audiences by segment and funnel stage, and build Lookalike strategies based on your actual customer base.
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