I heard him speak about it the very first night he made the announcement, maybe a month or two ago. I didn't get it then, and when he's spoken about it since, I still don't get it. I've visited the website, and I still don't get it. I hear the words, and I understand the sentiment, but the concept seems completely nebulous.
It's kinda like Twitter to me. I've registered; I can tweet; but for the life of me, I can't grasp the practical applicable use of the tool, no matter how much everyone else is raving about it.