In many ways this is asking for “the algorithm” but for Discourse.
So many things can go into “the algorithm” for picking interesting stuff:
- Who is it? Eg: “I tend to care a lot about posts that Jane made”
- What is it? Eg: “I tend to care a lot about very well written posts”
- What is it? Eg: “I tend to care a lot about topics in this meta vector space”
- How popular is it? Eg: “I tend to read stuff that lots of other people like/read”
- And so so much more.