Forthcoming in the AER: "Social Media, News Consumption, and Polarization: Evidence from a Field Experiment" by Ro'ee Levy.
A new large field experiment on Facebook randomly offered people conservative or liberal news outlets. This random assignment then led Facebook news algorithms to limit exposure to counter-attitudinal news and thus increased #polarization.
Nudging people to like either liberal or conservative Facebook pages leads them to visit, does not change political views but out-party (vs in-party) sites decrease affective polarization. People see more in-party stories due to Algorithm #SocSciResearch