In my opinion, that's a well-worth-reading blog entry. I think it
speaks in loud words of more than one syllable to the nature of what
knowledge federation must address.
I also suggest following the link to the event itself:
http://www.scottberkun.com/blog/2009/the-challenge-of-visible-twitter-at-conferences/
and from there to danah boyd's related message:
http://www.zephoria.org/thoughts/archives/2009/11/24/spectacle_at_we.html
Meanwhile, also visit
http://www.despair.com/somevedi.html
which is linked in the comments field.
Cheers
Jack