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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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available to users with a reputation of 10,000 or greater
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awarded to encourage and incentivize positive community actions within the site.
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For questions regarding the site CAPTCHA, an anti-spam device used here to confirm that there is an actual person submitting a post.
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For coordinating projects to help clean up the main site.
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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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the norms and standards of accepted behavior and politeness in our community. The golden rule is "Think before you post."