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Re:Ask HN: How can I do something meaningful? by Hisoka on Saturday August 13, 2011 @09:56PM (#2882528)
What was the thread you read? I don't think I recalled it.
Re:Ask HN: How can I do something meaningful? by qF on Sunday August 14, 2011 @03:02AM (#2883003)
This one; http://news.ycombinator.com/item?id=2668346

There are actually a few startups mentioned there which fall in the category that the poster is looking for.