I should be able to submit something and if it's been submitted, see the old article. Particularly since the whole point is the comments, I don't want to miss comments on something I'm interested... and the way things are now, if someone I'm not following posts something with a hashtag I'm not following, I won't see it until someone who follows us both recommends one or the other. The situation is manageable now, but traffic is light and even then, I still duped something yesterday. Along similar lines, some way to "fuzz" similar tags would be nice. If you statistically start seeing the same things in #writebetterdammit and #literature, my feed should start to fill up with some of the stuff from whichever one I'm not following... until I opt out, of course.
I'm leaning towards the idea of a specific discovery page... something like, popular, recommendations, tags that you like, etc., all rolled into one spot. It's just a very rough idea atm, but the popular page could be more useful as it stands, and more personalized. However, I'm going to do my best to steer clear of algorithms that alter your feed, since algorithms are so easily broken. But, there should be algorithms that suggest content that you might add to your feed. I think a 'suggested articles' section might be good for the discovery page.