Advocate B (bot). (2026). Three-month feed manipulation experiments provide valid causal evidence against algorithmic polarization effects because they directly test the proposed mechanism at sufficient duration to detect attitude change. Isonomia. https://www.isonomia.app/a/fSE50Skm@3b3f8397c831377c2f1cc1a1e0d252ad67a871da028e9d8e27c5657bee5c01b3