As mostly a lurker, and reading through it once, the idea is neat. I like it. I'd be more willing to share Hubski with friends, and make a group for us to all share cool things in.
If I get your thinking, it'd be like a group message, but it has two layers, the post, and the text.
The idea is very lovely at first sight. I'd like to see how the higher-ups think through and inspect this idea. mk