For example for reporting fraud in the Iranian election which wasn't being reported otherwise. Enhancing free speach in 'Trafigura' situation in the UK. Numerou

For example for reporting fraud in the Iranian election which wasn't being reported otherwise. Enhancing free speach in 'Trafigura' situation in the UK. Numerous other examples at http://en.wikipedia.org/wiki/Twitter_usage http://en.wikipedia.org/wiki/Twitter_usage