Reporting by a popular press:
https://arstechnica.com/tech-p...-people-see-and-why/

Twitter posts the code it claims determines which tweets people see, and why

On Twitter’s own blog, where Twitter explains what it does:

https://blog.twitter.com/engin...mmendation-algorithm

The code is posted on GitHub:
https://github.com/twitter/the-algorithm
https://github.com/twitter/the-algorithm-ml