This idea immediately makes me think of Tweetdeck which sounds neat until you're working on something and are constantly distracted with new items popping into the comment stream. Maybe I'm just getting old but I would prefer a good weekly summary of the news: allow plenty of time for meaningless ephemera to be filtered out and just tell me what happened that's relevant. While technology moves fast, even JavaScript doesn't move so fast that checking in weekly will leave you hopelessly behind.
Initially I tried to get the users to summarize articles, users can actually send their own summaries on every article already (when you click on +more on the card). It would start with a robot summary and people would correct it or extend important points to it. But that only works if I have users :) And then a weekly summary would be easy to achieve.
I like the idea of user curated summaries much more, the scrolling is a bit distracting. Short news articles are surely attractive, if they are summarized by the community and the community checks if the summary is unbiased I might use that.
Bias and long articles are the reason I added the summaries, I think if a summary extracts the most important points the bias and the fluff around it could get removed. Maybe this solves the bias problem.