While I like prismatic a lot, it builds on idea of a filtering bubble that you put yourself into. So it's better for finding something that you'll be interested in and you already know that (since it's in your interests, and your friends quote on that), but it's absolutely orthogonal to rss reader.

I've never been a fan of giving away choice of what to read to automated systems. Of course some percent of suggested stuff is ok, but actually it all boils down to three components for me. Mostly I read what I want to read (interests). Then I'm interested to follow popular stuff (keeping up). Then I'm all right to take a peak at what a program suggests I could like (discovery).