A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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For *general* questions about using code libraries with Stack Exchange sites or the API. To POST, or announce a library, use the [library] tag instead. For questions about an existing, Stack-Exc…
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used for questions regarding the limits of the API, including quotas as well as throttling.
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a PHP wrapper for the StackExchange API created by George Edison.
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Questions about Stack Exchange notifications and the API routes that provide them. Not about apps that provide notifications - use [notifier] instead.
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Stack Exchange API Contest (Completed in August 2010). This is for questions about or entries therein.
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For questions about the /review path where users can view and act on posts by other users that the system thinks may need attention. <!-- from http://meta.stackexchange.com/tags/review -->
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