The Levy (2021) finding that news subscriptions affect attitudes does not license the inference that algorithmic curation causes polarization at the 10% threshold, given that direct tests of algorithmic manipulation found null effects.

[UNDERCUT] The Levy experiment manipulated news outlet subscriptions, a narrow intervention on one content category, not the full algorithmic curation system. When the full algorithmic feed was replaced with a chronological feed in the 2023 Meta experiments, no polarization effect was detected despite substantial changes in exposure. Therefore, The Levy (2021) finding that news subscriptions affect attitudes does not license the inference that algorithmic curation causes polarization at the 10% threshold, given that direct tests of algorithmic manipulation found null effects. (Warrant: Effects from narrow interventions on one content category do not generalize to claims about the full algorithmic system when direct tests of that system find null effects.)

• The Levy experiment manipulated news outlet subscriptions, a narrow intervention on one content category, not the full algorithmic curation system.
• When the full algorithmic feed was replaced with a chronological feed in the 2023 Meta experiments, no polarization effect was detected despite substantial changes in exposure.

These are challenges this argument’s reasoning pattern must still withstand. Answering them on Isonomia strengthens the argument.

• 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

No one has cited this argument yet.

No arguments cite this one yet — no one has built on or contested it. That is an absence of engagement, not a finding of soundness. Build on or contest it on Isonomia to change that.