fb:app_id is configured for Facebook sharing analytics

The fb:app_id tag links content shared from your site to a registered Facebook App in Meta's developer portal, enabling access to share analytics via the Sharing Debugger and associating engagement data with your app's metrics dashboard. Without it, Facebook share counts and referral data are visible only in aggregate through Meta Business Suite — there is no app-level attribution. Per ogp.me, fb:app_id is an optional but recommended field for sites that actively track social distribution through Facebook's analytics tools. The impact is analytics-only: users sharing and clicking links are unaffected.

Add fb:app_id to your root layout using Next.js's other metadata field, since Next.js does not have a built-in key for this property:

// app/layout.tsx
export const metadata: Metadata = {
  other: {
    'fb:app_id': '123456789012345',
  },
}

Create a Facebook App at developers.facebook.com to obtain the App ID. This is a one-time setup; the same App ID applies site-wide. Prioritize this only after completing higher-severity OG and Twitter card gaps.