How to create lookalike audiences from Instagram followers

Quick Answer

To create a lookalike audience from Instagram followers, first build a custom audience from Instagram account engagers (which is the closest proxy to "followers" in Meta Ads Manager), then create a lookalike from that source with a 1%–3% similarity range and your target country.

Step-by-Step Guide

1. Open Audiences

In adsmanager.facebook.com click the menu and pick Audiences under Plan.

2. Build the source custom audience

Click Create audience > Custom audience > Instagram account. Select your Instagram account and pick Everyone who engaged with your Instagram account with a 365-day retention window. This is the broadest proxy for your follower base.

3. Save the custom audience

Name it "IG-Engagers-365d-Source". Click Create audience.

4. Create the lookalike

Click Create audience > Lookalike audience. Pick your source — the custom audience you just made.

5. Choose the country and size

Select your target country (e.g. United Kingdom) and pick a similarity percentage:

• 1%: Most similar, smallest audience (~400k in the UK)
• 3%: Broader reach (~1.2m)
• 5%: Even broader (~2m)

For testing, 1% is sharper but 3% scales better.

6. Create multiple lookalikes

Click Advanced options > Create multiple audiences and pick 1%, 2%, and 3% at once. You can A/B test them against each other.

7. Use in a new ad set

In a new campaign, at the ad set level, select the lookalike audience. Exclude existing converters so the ads reach new people only.

FAQs

Why can I not make a lookalike directly from followers? Meta does not expose follower lists — use engagement audiences as a proxy.

Which lookalike size is best? Start at 1–3%. Go bigger only when the smaller lookalike saturates.

How big should the source audience be? 1,000 to 50,000 for best quality.

Can I make a lookalike from purchasers? Yes, and this is usually the highest-performing source.

How often should I refresh lookalikes? Every 60–90 days as your customer base grows.

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