Facebook and Instagram users see wildly different political news in their feeds depending on their political beliefs, but chronological feeds won’t fix the problem with polarization, new research published Thursday suggests.

The findings come from four papers produced through a partnership between Meta and more than a dozen outside academics to research the impact of Facebook and Instagram on user behavior during the 2020 election. The company supplied data from around 208 million US-based active users in aggregate, totaling nearly all of the 231 million Facebook and Instagram users nationwide at the time.