Anonymous. (2026). Boxell et al.'s acknowledgment of theoretical spillover channels does not provide evidence that spillovers from young social media users to elderly non-users occurred at sufficient magnitude to account for the observed demographic pattern. Isonomia. https://www.isonomia.app/a/qoGiKoN0@c502fe7779add90189727442c820cc19b03fe86c72236b233c375ecf45f4a27e