Short and sweet: Awards honor Twitter tweets

• Story Highlights
• The first annual Shorty Awards, held Wednesday, honor 2008's best Twitter tweets
  
• NYC event recognized winners in 26 categories, including news, humor and tech
  
• There's an art to writing a great tweet within 140 characters, winners say
  
• Today also is Twitter's Twestival -- gatherings in 175 cities to raise money for charity
  
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