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Understanding <a href=https://npprteam.shop/en/articles/tiktok/tiktok-ads-lookalike-audience-setup-scaling-2026/>how to optimize TikTok lookalike audiences in 2026</a> requires knowing how platform algorithm updates and audience overlap dynamics have shifted from previous years. TikTok's 2026 interface introduces refined source audience validation, similarity percentage controls, and dynamic lookalike expansion that differ significantly from legacy setups. Best-performing campaigns now leverage seed audiences of 500-5,000 users with specific engagement thresholds, rather than generic customer lists, creating tighter initial lookalike models that scale more predictably. Testing similarity ranges between 70-95% reveals critical breakpoints where acquisition cost stabilizes while volume remains sufficient for statistical significance. Media buyers targeting e-commerce, SaaS, and performance verticals benefit most from this structured optimization approach, as it reduces wasted impressions on marginal audience tiers.