Not a bad idea, I just wonder what you'd be looking for.
I'm assuming the underlying idea is to generate discussions or give feedback about the bumps. Not in any way trying to shoot down your idea, I just see this as being a bit difficult if the comments were attached to the bumps themselves... it'd have to be done right. With 1500 or however many bumps there are, if there was no central hub, I'd worry that every 20th bump or so would just end up with a comment like "Cool," or "I like this one."
Thinking about it more now, the idea is solid. It would be a challenge to execute it right, in a way that would lead to it being used properly.