Video borrowed (stolen) from the nice people at SME.
I'm also a big fan of the US Marine Corps use of social media and follow their Twitter feed. They put out some interesting pieces and provoke a discussion.
The US Military are pretty advanced when it comes to social media, and I think its a good thing generally, so long as it serves to promote a learning culture within the organisation as well as outside.
Anyway, take a look and make up your own minds.