Twitter took off from simple to 'tweet' success - USATODAY.com

Twitter took off from simple to 'tweet' success - USATODAY.com: "'What are you doing?'

That question is the rocket fuel for Twitter — a hot social-network service that lets you tell people what you are up to at any given moment of the day — via cellphone, instant messenger, or the Web. Never heard of it, you say?

'What are you doing?' is the question Twitter asks 'Twitterers' to answer in a simple text message as they connect with friends, co-workers or the wider world. Twitterers 'tweet' about everything from what they had for lunch to how much they enjoyed their latest Netflix DVD. If that sounds silly and incredibly narrow at first, don't worry, you're not alone.

'When people hear about Twitter, their immediate reaction is that it's the simplest and stupidest idea in the world,' says co-founder Biz Stone."