If you are at all interested in (a) Twitter, (b) bureaucracy or (c) both then you will find this 20 page document very interesting indeed.
A template created for each government Department to modify for itself, it's quite old (July 2009) but I haven't seen it linked to before (and it will be interesting to see if the new Government embraces it, despite the new Prime Minister's well known attitude to the medium).
Learn about the Cabinet Office approach to the "zeitgeist", "credibility" and so much more...
Hat tip: AW