You raise an important point re: Subscribing to People This is the trust of social-networking i.e. this is what we do when we establish links (technology is just catching up). We subscribe to a persons views, insights, and a myriad of other attributes.

Also note, that this is what is typically referred too as URI dereferencing in Semantic Web technical parlance. Thus, monikers aside, the concept of identifying and peeling back the layers of ones digital onions is basically getting ready to explode. A FOAF profile URI is the digital container of said personal attribute data which can be exposed Blog posts, Wikis, shared bookmarks, feeds etc..

As you know, blogrolls where an early attempt to do something similar, but as predicted, it use has waned due to semantic deficiency.

btw - have you had a moment to revisit SIOC?