Bode, L. (2017). Pruning the news feed: Unfriending and unfollowing political content on social media. Research & Politics, 3(3). (Nutshell: Unfriending over politics is rare and mostly occurs among most partisan.)
Shin, J., & Thorson, K. (2017). Partisan Selective Sharing: The Biased Diffusion of Fact-Checking Messages on Social Media: Sharing Fact-Checking Messages on Social Media. Journal of Communication, 67(2), 233–255.
Gillani, N., Yuan, A., Saveski, M., Vosoughi, S., & Roy, D. (2018, April). Me, my echo chamber, and I: introspection on social media polarization. In Proceedings of the 2018 World Wide Web Conference (pp. 823-831).