oh, I'm bookmarking this one! I like tags as a kind of index, and I LOVE the idea of the multi-level tags! On tumblr, probably 70-80% of what I reblogged was "sherlock meta" (and probably 10% or so each, "fic rec" and "art") so it drove me wild that I couldn't sort down through tags, to retrieve a subgroup on a topic. I'd have to have, and remember, and remember to use, a specific tag for that topic. And still there would probably end up being a ton of individual posts. So most of the time I just had to resort to "I know I remember reading something about this" without ever being able to hope that I would be able to dig up the post itself.