I'm pretty sure I figured it out, the high-level view is basically any content that generates conversation is marked higher. Usually this is measured by comments in a given period of time. I don't know exactly how long this period of time is, but I think it's around 6-12 hours, with additional time extended based on "rate of good conversation".
There are some parameters for it, such as the quality of conversations. Quality, is measured by the intersection of number of comments, likes given to comments, and each top-level comment is given a higher score if there are nested comments underneath, as well as likes given to nested comments. There's also accounting for length of text in each comment. @csallen how did I do?