Anonymous. (2026). The majority of well-powered field experiments testing algorithmic feed manipulation on affective polarization report null effects, though Piccardi et al. 2025 and Levy 2021 provide partial counter-evidence with external validity limitations that prevent establishing a population-level effect at the 10 percent threshold. Isonomia. https://www.isonomia.app/a/jxbRGfe1@f90832f4d94e4a3295163f8d1095cbea23c96927046c4034bad34ba3de44acda