As the presentation started the tweets summarised the key points over and over again as each tweeter delivered their individual perspective. For every 20 tweets of diligent relation of the key points would come the occasional voice of decent "not sure a really agree with that". At the virtual back of the room a few 'bloggers' revelled in the fact that a few people were leaving the conference and preferred not to comment of the presentation, "nobody watching the presentation in the blog zone".
I prodded with tweets of my own, trying to get a deeper response from those present.
I don't pretend to understand the phenomena any better but the experience did have a tangible unique quality which I can imagine being highly addictive.