Collective ingenuity

Let 1,000 Ideas Bloom is a good overview of different web sites that make it easy for people to share their nifty ideas. The article was published on November 27, 2003. What are the Web 2.0 services that have entered the space of idea-sharing since then?

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Random Japanese sentence: その猫は高くのびた草を利用してその鳥の方にしのびよった。 The cat took advantage of the high grass to creep on the bird.