The non-Nebraska basketball thread you're asking about currently resides in the college basketball section.
As far as the feedback system goes, there are no hard set rules for reactions though one can infer that a downvote is negative and an upvote, heart, and/or thanks are positive. The confused and sad reactions are considered neutral. My personal use of a downvote is to respond to a post that I find is a combination of unnecessary/poor taste/detrimental where responding will infer that I actually want to have a conversation about said post.