To build a lookalike audience on Facebook with Claude or ChatGPT, name an existing custom audience as the source, choose a country and a ratio, and approve the preview. PaidSync.ai creates the lookalike through Meta. The source audience decides the quality, so choose your best customers rather than all visitors.
A lookalike finds people who resemble a source audience in one country. The pieces come from these tools:
list_fb_audiences lists your custom audiences with their IDs, so you choose the source.create_fb_lookalike_audience creates a lookalike from a source audience, for a country and at a chosen ratio.The list reads. create_fb_lookalike_audience writes to the account.
| Tool | What it needs |
|---|---|
| list_fb_audiences | Reads only. Nothing, it reads the active ad account. |
| create_fb_lookalike_audience | Changes the account. A name and the source audience ID, as text. Optional: a country and a ratio. |
A small or low quality source gives a weak lookalike. Meta needs enough people in the source, so check its size in the audience list.
These steps use Claude. PaidSync.ai also works in ChatGPT, so you can build a lookalike audience on Facebook there with the same prompts.
Register at paidsync.ai and sign in to Facebook when Meta asks. Have a customer audience of real size already built.
Find PaidSync.ai in Claude's connector directory, add it and sign in. Ask for your Facebook ad accounts, then name the one to use when you build a lookalike audience on Facebook.
Ask Claude for your audiences and pick the one that holds your best customers.
Pick one country and a ratio. A small ratio is closer to the source, a larger one is wider.
Claude shows the dry run. Say yes to create it.
List the audiences and find the lookalike. It may take time to populate in Meta.
Every Meta tool PaidSync.ai offers is on the Meta Ads MCP server page. To make the source, see how to create a Facebook custom audience with AI.
Choose a source audience, country and ratio with Claude or ChatGPT, then approve the preview through PaidSync.ai.
A small ratio is closer to the source and a larger one reaches more people. Test both.
Yes. A lookalike is built from an existing custom audience.
It may take time to populate. Check the audience list.
Trying it to build a lookalike audience on Facebook costs nothing on the free plan, which covers 15 tasks a month with no card. Pro starts at $99 a month. Details are on pricing.
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