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Implementing <a href=https://npprteam.shop/en/articles/facebook/facebook-lookalike-audience-setup-best-practices-2026/>proven source audience selection strategy for lookalike campaigns</a> separates high-performing accounts from those spinning wheels on dead reach. Your source audience is the foundation—if it's contaminated with window shoppers, tire-kickers, or one-time buyers, your lookalike will replicate those traits at scale. This resource reveals which conversion events deliver the cleanest, most replicable customer profiles for lookalike modeling, and how platform updates in 2026 changed the math around audience size and recency. You discover tactical windows for refreshing source audiences, cross-testing between purchase and revenue-based sources, and avoiding the common trap of building lookalikes from engagement-only audiences. Teams running multiple product lines or geographic markets will find the segmentation framework essential for maintaining relevance and preventing audience overlap waste.