Factery is a search API with a twist. Instead of links, it returns facts. Actually, it returns links, too. But the real interesting stuff is that it extracts the sentence or two that best answers a user’s search.
Another way Factery is different is that you decide the sources to use. You can search Twitter, Digg, or a standard search engine. All you need are pages containing a list of links and Factery does the rest
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- Realtime Search Engine Factery Labs (ghacks.net)