Social software - FB, Twitter etc - didn't exist in 1999. Cluetrain was precient in describing the space they would occupy, and how important they would be for business.
But how could they lose?! Hyperlinks subvert hierarchy! The triumphal tone throughout indicates there's clearly no stopping the cluetrain; it's obviously inevitable.
#45 Intranets naturally tend to route around boredom. The best are built bottom-up by engaged individuals cooperating to construct something far more valuable: an intranetworked corporate conversation.
This is why Slack and tools like hubot work (see rules 46 through 49 as well).
I mean, it's cool and all. But is it more than that?