Twitter

Format: Microblog

Platform: Proprietary; API available.
 
Funding: Spark Capital, Boston; Bezos Expeditions, Seattle; Union Square Ventures, New York City; Digital Garage, Tokyo

Ownership: Private
 
Competitors: Identi.ca, friendfeed.com, Plurk.com
 
In their own words:
"Twitter is a service for friends, family, and co–workers to communicate and stay connected through the exchange of quick, frequent answers to one simple question: What are you doing?"
 
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