here's a simple visualisation of the use of official country codes (eg #aus) in a week's worth of tweets from the search stream for #worldcup.
rate is about 2hours of tweets per sec. orb size denotes relative frequency of that country code. edges denote that those two countries feature a lot in the same tweets. movement is based on gravitational like attraction along edges.
the quiet period at about 0:17 is a twitter outage :)
here's the original processing applet version with a bit more discussion