Anonymous. (2026). The three large null experiments refute the ideological-diversity/echo-chamber pathway to algorithmic polarization but do not address the AAPA-amplification pathway identified by Piccardi et al. (2025), which remains supported by only one 10-day study on a single platform. Isonomia. https://www.isonomia.app/a/CPVqzvKu@2cd6ced7aa08b60d696bb93353fbbff3999795bc20ea8d6a17a1767d4da36517