Gnus (http://en.wikipedia.org/wiki/Gnus) is a reader for all kinds of messages including email and RSS feeds. You can mark and manipulate messages pretty much any way you want.
It's certainly a problem to be solved and if Hubski does it... all the better.
One thing that I think would be easy, is to give a post more staying power in your feed if you commented on it. Currently posts sort in your feed based on age, shares, and a bit on commenting. But it doesn't distinguish your comment activity from others. I'm going to think on that. If you commented on a post, you'd probably be interested in it hanging around just a bit more.
It adds another page, but I suppose it could be tucked away in your profile.
Certainly. When I want to follow a discussion, I save that post. It being more visible on my feed page would be cool too. >You could do this once you've read/watched/listened to it already and have no interest in following it's comment stream. This could help keep your feed clean. NG raises an interesting point. Right now, Hubski uses color differentiation to distinguish between read and unread posts. A visible/hidden system does appear to "lighten up" the feed page, but it brings up a one issue: if I can hide my posts, how far does that process has to go until I have an empty feed page? If one wants to clear clear one's feed page, this is not the best method to do so. Too much clicking.
Certainly. When I want to follow a discussion, I save that post. It being more visible on my feed page would be cool too. That is definitely something I am going to consider. Even just a little boost might be something.