Founder, Twitter
Age: 36
The latest from the creator of Blogger, Twitter gives each user a webpage where short text updates (known as "tweets") can be posted to the site via IM, SMS or blogging tools. The result is a torrent of short notes and inane observations pouring in from buddies throughout the day. Fans say Twitter is an invaluable way to stay in the loop. Others aren't so sure. Age: 36
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