Media & Publishing / Audience
First-Party / Addressable Audience Reach ~ (aliases: logged-in rate, authenticated reach, known audience, addressable %)
How much of the audience the publisher can actually identify and target directly, the number that matters once third-party cookies are gone.
The fork, why two teams get different numbers
Three shrinking circles wear the "first-party" label.
In the Metric Library
- The full fork, both definitions worked all the way through
- The trap that makes the number lie, on a real export
- Every formula variant, spelled out
- The reconciliation anchor, what to tie it to and when to refuse
Reference: IAB Tech Lab addressability/identity frameworks (reference); privacy-consent (e.g. · IAB TCF) convention (reference); audience-measurement practice (no single standards body)