I'm ashamed to say that I've come late to the fascinating social media experiment run by officials in Sweden. The country's official twitter account, @Sweden, is being handed over to its citizens to say whatever they want. The New York Times has a good review of the project.
There is a selection process to find people comfortable with twitter who can write in English, but there's no filtering or censorship. The account is handed to different people each week, and I am finding it fun and enlightening. I highly recommend following the account!