This is too good to be true. Yesterday I read Sebastiaan's write-up of how he graphically a link between two individuals who both liked the same thing on the internet, and how, by doing that, he could alert himself to things he might like.
Today I finally see, in my reader, an earlier post from Kicks Condor, in which he talks about surfacing other readers who have linked to things he has linked, and how that might help him to discover interesting things to read. That could even be the basis of a self-organising discovery engine.
Clearly, they ought to know about one another. Maybe this post of mine will trigger that.