It wasn't clear from the slideshow, but he was comparing it to a kind of a Google PageRank for humans. I wonder if anyone's already running some kind of PageRank-ish algos on tweet propagation.
Must browse for anyone interested in the strategies and understanding of analytics & marketing for modern web businesses. I git it a solid 9/10 (a little too long)
We're going to split them apart when we get a chance and upload them in bits on slideshare.
Thanks for the interest!