Do you tweet???

To be honest, when my English teacher asked me to write about Twitter, I had never heard of it...
So I went to the website and discover that it's "A global community of friends and strangers answering one simple question: What are you doing? Answer on your phone, IM, or right here on the web!"

Still to be honest I don't really see the interest of the "voluntary spying": why do people wants to know every activity of a friend? What king of interest do they find in sharing their diary?
Obviously, it might be interesting for professionals if they want to broadcast news from a modern way! Nervertheless, i think it's interesting if your network is a big one!