What is a Lookalike Audience on Meta?

1% Lookalike = top 1% of Meta users most similar to your source (smallest, highest similarity, most expensive CPM). 10% Lookalike = top 10% most similar (10x larger, lower similarity, cheaper CPM). 1% is best for conversions; 3–10% for broader reach or when 1% audience is saturated.

Meta typically takes 1–6 hours to create a Lookalike Audience after submission. The audience size shown is an estimate — actual reach depends on targeting overlaps with other campaign settings. Lookalike Audiences are dynamic and update periodically as Meta's user base evolves.

Ranked by quality: (1) Recent purchasers or paying customers (best signal — these people converted), (2) High-LTV customers segmented from your CRM, (3) Lead form completers, (4) Website visitors who reached checkout without purchasing, (5) Video viewers (25%+ completion), (6) Engaged page followers (weakest signal). The rule: use the highest-intent action as your source. 500–1,000 purchasers creates a stronger Lookalike than 10,000 generic website visitors.

Yes — always exclude existing customers and recent converters from prospecting Lookalike campaigns. If you show acquisition-focused ads to people who already bought, you waste budget and potentially annoy customers. In Meta Ads Manager: under Audiences in your ad set, add your customer email list as an exclusion. This ensures your Lookalike targeting only reaches genuinely new prospects who have not already converted.

Scaling tactics: (1) Widen Lookalike percentage (1% → 2–3%) as the smaller audience saturates, (2) Stack multiple Lookalike sources in one ad set (purchase Lookalike + LTV Lookalike), (3) Duplicate high-performing ad sets and increase budget by 20–30% (avoid large jumps that reset learning), (4) Test new geographic markets with Lookalike from domestic customers, (5) Create Lookalikes in new countries where your customer profile exists. Monitor CPM and frequency closely when scaling — rising frequency (above 3.5) signals audience saturation.