Twitter open-sourced its recommendation algorithm:

"Twitter showed us its algorithm. What does it tell us?"

"The engagement formula is useful both to learn about the overall behavior of the system and for individuals to learn how to control their feed. To be clear, it is far from being sufficient for either purpose."

https://knightcolumbia.org/blog/twitter-showed-us-its-algorithm-what-does-it-tell-us

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