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David King, Active on Quora both posting questions and answers.
Votes by Keith Rabois, Quora User, Alexis Madrigal, Marc Bodnick, and 9 more.
Not sure how "coolest" would broadly be interpreted.  I think Hunch and Aardvark have had some successful PR telling the story of their startups so many might perceive those as cool.

Personally, I find usefulness of function coupled with simplicity, authentic community, and form as "cool" so I'm voting Quora.
UpvoteComment18 Jan, 2010
David King

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