The Netskills Web2Practice guide to Microblogging. If you want to find out what Twitter is all about, this would be a good place to start.
Blogging and Microblogging
HABLAMOS DE MICROBLOGGING
Enterprise Microblogging by Socialtext
Microblogging - defined
O que é Twitter e microblogging
CPMX2 - Microblogging
Twitter in Plain English