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.

Type to find tags:
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Questions about whether userscripts ([script] tag) with certain functionality exist. Some members of the community may react to these questions by creating those userscripts, should they not exist.
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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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Applications that run on Linux natively or questions about using the API on the Linux platform.
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