Why Your Facebook Ads Lose Data After You Add a Cookie Banner
Adding a cookie consent banner is the right thing to do. It keeps your website on the correct side of privacy law. But many marketers notice something odd soon after: their Facebook and Instagram ad reports start showing fewer conversions, even though real sales have not dropped. If that sounds familiar, this guide explains what is happening and how to fix it. The hidden problem Your Meta Pixel usually fires the moment a page loads. Once you add a consent banner, every visitor who clicks "Reject" should not be tracked with cookies. An unmanaged pixel handles this badly. It either keeps tracking people who said no, which breaks the law, or it loses their activity completely. In the EU, UK, and several US states, declined visitors can be a large part of your traffic, so the data gap is real. Why it matters There are two costs here. The first is legal. GDPR and the ePrivacy Directive require consent before non-essential cookies load. Fines reach up to €20 million or 4% o...