Hi all - very active conversation - :)
The goal of the new feature is to create opportunities for readers to discover more content that is related to what you're writing about. We've included content from your archives, from other WordPress.com blogs and for Mainstream Media sites (MSM). MSM's are not paying Sphere, nor WordPress for the links.
Like any technology, we're making lots (and lots) of tweaks on the fly to get the filters properly tuned. While subjective, we've been successful in making these tweaks on a large number of partner sites (www.sphere.com) so I'm hopeful (with a little patience and goodwill), we'll make improvements as we go along. In the meantime, you're input is really critical for us to make those improvements, so please keep sending.