Custom Audience

A custom audience is a targeting option that lets advertisers reach specific groups of people who have already interacted with their business, such as website visitors, email subscribers, app users, or past purchasers. Custom audiences are created by uploading customer lists, using pixel or SDK data, or leveraging platform engagement signals to match users on advertising platforms. Sources can include CRM exports, email lists, phone numbers, website visitor pools, and even people who have watched a certain percentage of your video content. Why it matters: custom audiences are fundamental to remarketing and personalization strategies because they target people who have already demonstrated interest in your brand, which typically results in two to three times higher conversion rates compared to cold prospecting audiences. For example, a SaaS company can build a custom audience of trial users who did not convert, then serve them testimonial-driven ads addressing common objections. On Meta, custom audiences often achieve match rates between 50 and 70 percent when email lists are clean and up to date. Best practices include segmenting custom audiences by intent level, refreshing lists frequently to remove converted users, and layering exclusions to avoid wasting spend on existing customers. Custom audiences also serve as the seed data for building high-performing lookalike audiences, making them a cornerstone of any full-funnel paid social strategy.