Factual
http://www.factual.com/
Service for basically creating shared databases: sounds quite interesting!
Factual is a platform where anyone can share and mash open data on any subject. For example, you might find a directory of California restaurants, a database of endocrinologists, or a list of American Idol finalists. We provide smart tools to help the community build and maintain a trusted source of structured data. And this data can be used through widgets and APIs to help application developers and content publishers be more innovative and productive.
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