This guy compiled a list of Top Three Twitter Accounts from a number of different countries. Of course, it is impossible to make such a list perfectly - many people never put their country when registering, others have moved, others have multiple accounts, etc., but nonetheless, it is a nice list of people you may want to check out and follow if you want to broaden your international horizons.
A number of countries are missing, though. There is no Serbia, for instance. But you can find a full deck of cards of Twitter users just from Belgrade, Serbia here.
More like this
From John I learned that Serbia is becoming a birding hot-spot!
Graduate of the University of Belgrade (Serbia), City University (UK) and UNC-Chapel Hill (USA), with a Masters from University of Belgrade, Danica Radovanovic is currently in Belgrade without a job and she
Diabola in Musica
Hoxful Monsters
StevenBerlinJohnson
Vedran Vucic is a Linux afficionado in Serbia.
That list makes me proud to be EnglishBritish.