The paper is also worth reading. Here's part of the conclusion:
"Understanding the factors that make social media posts go “viral” online can help to create better social media environments. While social media platforms are not fully transparent about how their algorithmic ranking system works, Facebook announced in a post titled “Bringing People Closer Together” that it was changing its algorithm ranking system to value “deeper” forms of engagement, such as reactions and comments (68). Ironically, posts about the political out-group were particularly effective at generating comments and reactions (particularly the “angry” reaction, the most popular reaction across our studies). In other words, these algorithmic changes made under the guise of bringing people closer together may have helped prioritize posts including out-group animosity." [0]
"Understanding the factors that make social media posts go “viral” online can help to create better social media environments. While social media platforms are not fully transparent about how their algorithmic ranking system works, Facebook announced in a post titled “Bringing People Closer Together” that it was changing its algorithm ranking system to value “deeper” forms of engagement, such as reactions and comments (68). Ironically, posts about the political out-group were particularly effective at generating comments and reactions (particularly the “angry” reaction, the most popular reaction across our studies). In other words, these algorithmic changes made under the guise of bringing people closer together may have helped prioritize posts including out-group animosity." [0]
[0]: https://www.pnas.org/content/118/26/e2024292118