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Re:Ask HN: Idea Sunday by clarry on Sunday April 20, 2014 @11:36AM (#7617110)
Reddit.

EDDIT: Re gamifying, karma does it.

Re:Ask HN: Idea Sunday by genericsteele on Sunday April 20, 2014 @11:39AM (#7617124)
But then how could I monetize it? I don't think I could run adverts on someone else's service?