This is cool, but I actually feel right now it leans more towards being twitter-like in a reddit UI than a reddit-like. The analogy to tagging on Reddit is posting to a subreddit, but it differs on Reddit in that posting isn't inclusive but exclusive to the discretion of the moderators(owners) of the subreddit(tag). The creates distinguishably different cultures in the comment sections between subs sharing the same content. How you go about approaching how moderation and classifying works will have a major effect on how the commenting and reaction experience will feel.