Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

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Tags

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 questions and bug reports related to the SE chat system.
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For questions concerning tag-synonyms.
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For questions about the review queues.
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Questions about diamond (♦) moderators, their powers, and actions they have taken.
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For questions about built-in search functionality of this site and about searching this site using external search engines.
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no Meta Meta Mathoverflow, so questions about this very site just get this tag.
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For questions on usage of links at MathOverflow (both links to various parts of this site and to other sites).
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For questions concerning using images in questions, image hosting, etc.
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For issues regarding the help center of MathOverflow.
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Cross posting refers to posting the same, or almost the same, question (or post) on different sites in the Stack Exchange network (or possibly also elsewhere).
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Some changes to questions, such as edits or receiving new answers, will "bump" them back onto the site's front page where the changes can be vetted by other users.
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the answer the question owner thought best met their needs. Accepting is encouraged but never required. This tag is for *discussing* issues related to accepted answers, not indi…
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For questions about comment @replies
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For questions concerning area51 proposals.
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Questions about suspected user spam, the spam flag or combating spam as a community
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Users without full edit privileges can suggest edits to posts and tag wikis
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For questions about the copyrights of the Stack Exchange sites themselves or about the posting of copyrighted material by users.
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For questions about the favorite question feature or the favorite tags feature.
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for problems and suggestions for the privileges gained by reputation on the main site and on meta.
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For questions about Markdown, a lightweight markup language used across the entire Stack Exchange network for post formatting.
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should be used when you are expecting a large number of diverse answers to a question.