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  "retrievedAt": "2026-07-16T18:22:15.897Z",
  "createdAt": "2026-05-04T21:21:42.631Z",
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    "text": "The dissociation between exposure change and attitude change in the Guess et al. (2023) experiment provides valid causal evidence that algorithmic exposure differences are not responsible for polarization at detectable magnitudes."
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      "text": "Allcott et al. (2020) found detectable polarization effects from four weeks of Facebook deactivation, demonstrating that polarization-relevant attitude change can manifest in experimental windows shorter than three months.",
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      "text": "If algorithmic effects compound over years, some detectable signal should appear in a three-month window, especially among heavy users in the experimental sample.",
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