I agree. I've almost forgotten how disappointed I am that sites like HN, Reddit, and so forth don't use my up votes as signals for a collaborative filter and suggest which comments and stories I might find interesting. (And by "interesting," I mean interesting, not something I agree with, a distinction too many people on HN don't seem to understand.)
That's a great idea. I could see a simple implementation that'll could work out. If I like comment 4954 and you like comment 4954 and later I like comment 5004 then it should recommend it to you.
