Definition
A lookalike audience is a group of people Meta finds who resemble a source audience, such as your customers. It was a standard prospecting tool for years.
Lookalike audience explained
Lookalikes are built from a seed such as purchasers or high-value customers and sized as a percentage of a country's population. With modern automation, broad targeting often matches or beats lookalikes, but they remain useful as audience suggestions.
Example
A 1% lookalike of past purchasers in the United Kingdom.
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