I feel like this is a hard problem. Drudge report and it's imitators tried to solve it through manual curation, reddit tried to solve it through crowd voting, and so have many others. I think that a utility to do this for yourself and taking other feeds as inputs, deduplicating, and allowing you to create an output feed that you can curate as you please may actually work better. Once you start getting a network and the accompanying effects, then you can start creating a masterfeed. At that point, you've created twitter, but with news-sources/blogs as the inputs, instead of tweets.