How the US Air Force deals with blogs
eaves.ca
eaves.ca
This isn't a big bureaucratic dinosaur at work here. That policy is a simple heuristic which lets the end node make correct decisions without any central c&c input.
Rather than the uncoordinated/incomprehensible written diarrhea you get from many bloggers this seems positively enlightened.
Social Media is not going to destroy bureaucracy. If you work for a monolithtic company or a government they probably haven't discovered what social media is yet. But when they do management is going to treat it like any other form of media and threaten to fire anyone who uses it without permission. If you post anonymously they are going to hire a P.I. to track you down (like they do with news leaks now)
Social Media is a great tool and I personally suggest companies use it. But thinking huge companies and governments will be brought to their knees and forced is unrealistic.
Oh, and those who think there will be "too many social media users" to block are also being unrealistic. Once the threat of firing comes down 99.99999% of people won't do anything. Because the people who work for these huge bureaucracies are almost always the people who really need the job.