Exposure to opposing views on social media can increase political polarization. Christopher A. Baila, Lisa P. Argyleb , Taylor W. Browna , John P. Bumpusa , Haohan Chenc , M. B. Fallin Hunzakerd , Jaemin Leea , Marcus Manna , Friedolin Merhouta , and Alexander Volfovsky, PNAS 18.
https://www.pnas.org/content/115/37/9216