I am a little puzzled at the importance ascribed here to the core idea of G+ Circles, as laid out in the slide deck. Mostly because we designed an identical sha

I am a little puzzled at the importance ascribed here to the core idea of G+ Circles, as laid out in the slide deck. Mostly because we designed an identical sharing model and even gave it the same name at Etsy, without having read the deck. (Then we decided that was way too complicated and implemented something significantly simpler, but kept the name.)