paper · Brendan Nyhan · tradition:
empirical-social-media
Reducing exposure to like-minded sources on Facebook did not measurably change polarization over the study window.
The book’s stance. Bears on adding-channel-can-accelerate-divergence and the timescale-distinction. Pressure-tests short-run effects; supports the timescale distinction that short experiments cannot settle long-run dynamics. Quote-backed supports/pressureTests edges pending extraction of the source PDF.
Availability. Cited by reference; no local copy held in the repo.