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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designed to solicit opinions or best-practices on a particular topic, with the goal of reaching community consensus.
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For questions asking for help with the use of one or more of the site's features.
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For questions about tags: proposals to create, synonymise, merge, or remove tags, questions about usage guidance for particular tags, etc.
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when examining what is on-topic or off-topic, and why.
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For use when inquiring about a particular question e.g. inquiring about a specific question's suitability for this site.
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for new functionality you want, which cannot be achieved by current tools or moderation efforts.
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For questions about the closing of questions: whether, when, why, and how questions should be closed.
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For questions regarding the design elements of the main and meta sites e.g. CSS issues
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For questions about closing questions, or about a specific closed question.
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referring to the process of identifying and closing questions that are duplicates of another question.
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For questions relating specifically to posts with the [story-identification] tag on the main site.
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For questions about the real time, stateful web chat.
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For questions about the Science Fiction & Fantasy community blog.
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For questions relating to spoilers, content about a work (movie or book) that some users may not know yet,
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For questions about tag synonyms: either existing synonyms or proposals to create new synonyms.
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For use when discussing the appropriateness and use of comments
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should be used on posts relating to figures that are important to the Science Fiction and Fantasy:SE community who've recently passed away.
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For questions about the Meta site, scifi.meta.stackexchange.com itself.
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For questions related to upvoting or downvoting posts, or the workings of the voting mechanisms themselves.
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held to choose moderators for non-Beta Stack Exchange sites.
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For questions about the moderation policies of the site and actions taken by moderators.
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For questions about the review queues: the section of the site where users with sufficient reputation can review others' posts, e.g. for possible closure or deletion, and suggested edits.