Twitter took off from simple to 'tweet' success - USATODAY.com - 0 views
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Jennifer Nelson on 21 Jul 08By Jefferson Graham, USA TODAY SAN FRANCISCO - "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?