Meta lookalike audiences let you find new customers who resemble your best existing ones: buyers, email subscribers, high-value accounts. For most of the platform's history, they were the primary prospecting tool for Facebook and Instagram advertisers. In 2026, that's no longer true for most accounts. Meta has shifted heavily toward Advantage+ Audiences, an AI-driven system that effectively replaces manual lookalike targeting for the majority of campaigns. That doesn't mean l