TL;DR
Snapchat Lookalike Audiences find users similar to your existing audiences. Create from Pixel audiences, customer lists, or engagement audiences. Choose similarity level: Similar (most precise), Balanced, or Broad. Minimum source audience size varies by market. Lookalikes update automatically.
Create in Ads Manager > Audiences > Create Audience > Lookalike. Select your source audience. Choose target country. Select size (Similar/Balanced/Broad). Use your highest-value customers as the source for best results.
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