Echo is Feedback
Joi makes the case that the echo chamber effect in blogspace has a positive attribute and is not communal censorship. Essentially, creative and social networks deliberate to construct fit memes.
Related, Kevin Marks and Tantek Çelik developed Vote Links to reveal the bell curve of opinion.
It will be interesting to watch how deliberation in smaller groups can be augmented by Vote Links to accelerate new emergent patterns, as well as how the A-list uses them as new listening tools.