Twitter Mania: Will Twitter change the world? | PBS

Twitter has become a multi-headed phenomenon since MediaShift devoted a week to covering micro-blogging two years ago.

Twitter is now established as a new form of communication, an early warning system for breaking news, and a startup company in San Francisco that has no discernable income. And with the power of Oprah, CNN and Ashton Kutcher, it has become a full-fledged mainstream phenomenon, like it or hate it...