Oh, I really was not thinking about something akin to Reddit. I think I’m imagining something that hasn’t been invented yet much less groked. You would need to intuit the contours as well as the essence of those trail markers / blazes first. I’m still working on the latter. By “context sensitive” I mean specific to the user’s (let’s say my) interests and previous annotating habits (so, algorithms) AND something like the “expert writer” designation on Wikipedia for certain trails. But there would also be something still ineffable that would make locating the networked annotations one wanted more natural and intuitive.
Maybe this will come with the next “paradigm shifting wave of innovation” that will help us solve the world’s increasingly complicated problems? (Where are you Doug Engelbart?)