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Re:Show HN: Bateman, a stock trading system I'm working on by niggler on Saturday March 23, 2013 @01:29PM (#5428918)
Derwent Capital Markets (website down now) tried to do this with twitter, but ultimately collapsed:

http://www.idsnews.com/news/story.aspx?id=80469 http://venturebeat.com/2012/05/28/twitter-fueled-hedge-fund-...

Re:Show HN: Bateman, a stock trading system I'm working on by pnathan on Monday March 25, 2013 @11:31AM (#5437513)
Interesting. The venturebeat story suggests that the strategy works, but the company's web presence is dead. Hmm.