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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, influence site policy, or debate a particular topic, with the goal of reaching a community consensus.
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A request for assistance from community, moderators, or staff with one of the site's features
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Bug reports marked resolved or feature requests filed as done and live.
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Something amiss or broken with how you're working with the site? Report it.
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You have an idea for a new feature, or for a change to the existing functionality.
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asking to have some questions retagged, usually for a misused tag, or generally removing a tag
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General questions about tag usage on the main site
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Questions that deal with our cleaning up unwanted junk tags.
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Use this to tag anything about asking questions in general
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Anything about questions that were closed by community or a moderator
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If you have any issues with a specific question, use this tag. Include the link to the original question, if possible.
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Questions regarding reputation, see also [voting] and [privileges]
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Anything related to posting answers, e.g. about improving their content, voting on answers, editing others' answers, etc.
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Anything related to the editing feature, e.g. anonymous edits, suggested edits, the editing privilege, edit history, etc.
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To ask about flags, how to flag, when to flag, how flags work, and explanation why flags are declined.
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A request to add one tag as the synonym of another tag. Please be specific about which tag should be a synonym of which. Bidirectional synonyms and cycles are implicitly disallowed, so suggest wisely.
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Requests to have closed questions reopened by community or a moderator. Please include arguments – why should the question be reopened?
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Questions about the migration of posts to another Stack Exchange site
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Comments that can be added to questions or answers
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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.
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Relating to the Super User Blog, including questions, topics, reviews, and requested features.
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Questions about finding duplicates, handling duplicate content, voting to close, et cetera
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Questions about reasons for closing a specific question (use [specific-question] too), and the predefined reasons users are able to choose from when voting to close
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in scope in superuser.
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Questions about current moderation policy and support about the way moderation works
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for questions specific to down-votes, the community's way of telling peers that their content can be improved. Down-votes on meta site have different meanings.
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Any concerns about the scope of the site, as explained in the FAQ