Engagement patterns on mainstream partisan content do not establish population-level algorithmic polarization effects when direct experimental manipulation of algorithms produces null polarization outcomes.

[DEFENSE-UNDERCUT → 694url] Guess et al. (2023) directly manipulated algorithmic versus chronological feeds and found no detectable effect on affective polarization despite substantial changes in exposure to all content types including mainstream partisan content. The framing requires causal evidence, not correlational evidence about engagement patterns; engagement correlations do not establish that algorithms cause polarization. Therefore, Engagement patterns on mainstream partisan content do not establish population-level algorithmic polarization effects when direct experimental manipulation of algorithms produces null polarization outcomes. (Warrant: Observational evidence about engagement patterns cannot override experimental evidence directly testing the causal pathway from algorithmic curation to polarization outcomes.)

• Guess et al. (2023) directly manipulated algorithmic versus chronological feeds and found no detectable effect on affective polarization despite substantial changes in exposure to all content types including mainstream partisan content.
• The framing requires causal evidence, not correlational evidence about engagement patterns; engagement correlations do not establish that algorithms cause polarization.

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• Is the literature really agreed that defects of kind K bias inferences in direction B, or is the bias direction itself contested?Open
• Does study S actually have defect D, or is the description of S inaccurate?Open
• Is the expected magnitude of the bias from D large enough to overturn S's reported effect, or is the effect robust to plausible bias corrections?Open
• Has S (or a follow-up study) performed a robustness check or sensitivity analysis that addresses defect D directly?Open
• Is this critique applied consistently — i.e., would it apply to studies on the other side of the debate that share the same defect kind K?Open
• Is H supported by independent studies that do not share defect D, such that S's defect does not undermine H itself?Open

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