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In a previous question here on programmers, the OpenCalais system has been referenced as a solution.

Has anyone used OpenCalais? Can you identify pros and cons of the system ?

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I haven't used it, but when I signed up for it using a unique email address I haven't used anywhere else, I was spammed relentlessly. Apparently they've either been compromised and didn't bother telling people or they sold their database to spammers. If you use it, make sure you use a disposable email address.

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