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.

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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. (2025untested-default

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