info sharing

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Twitter gives its users each a page and allows them to "tweet" real-time information about what is happening and what's important to you now.

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A social catalog to organize and share collections of things you love.

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An informational database of how-to instructions and a social network for topical enthusiasts.

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A community where users earn money for writing on topics they know and love.

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A Q&A service hosted by Amazon.

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A social network to upload documents, books, and presentations for others to read and review.

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A network to publish and browse documents, catalogs, and magazines.

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A CNN sponsored social network for sharing news videos.

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A social bookmarking service to store and share web links.

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A network of over 40 community driven question and answer sites covering a wide range of topics