The internet's content should be controlled by the individual, not the feeds a big reddit,hn or facebook gives you. Simple good tools like what you provided should be a good step in cultivating an internet garden that can integrate into people's lives in a more orderly fashion.
However, I do see a place for search. I would love to add search terms like 'Nicholas Cage' and any time his name comes up (or perhaps even a related topic) I can track that.