Level: Intermediate
These audience types let a platform find new people who resemble an existing, proven audience — usually your customers or best-converting visitors — expanding reach without starting targeting from scratch.
Source Quality Determines Lookalike Quality
A lookalike built from your highest-value customers tends to outperform one built from a broad, low-intent audience like all site visitors.
Test Different Similarity Percentages
A tighter similarity setting produces a smaller, more closely matched audience, while a broader setting trades some precision for greater reach — both are worth testing.
Refresh the Source Audience Periodically
As your customer base grows and evolves, refreshing the source audience keeps the resulting lookalike aligned with your current, not outdated, best customers.
Next step: Use the Sales Letter Writer to make sure the ad copy shown to a lookalike audience still earns its own trust — resembling your existing customers doesn't mean this new audience already knows or trusts your brand the way your source audience does.