Anonymous. (2026). User self-selection is the dominant filter determining content consumption on Facebook, though the 5-8 percent algorithmic reduction in cross-cutting content does not directly bound the affective polarization impact because the hostility dimension of marginal content may matter more than ideological balance. Isonomia. https://www.isonomia.app/a/0tpD1K4y@2c04bf39e0bcc4c8d9acbf3720adb13c8a0bff4dcddb375c083722ed9d4a5133