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The hash sign # is an important community feature on Twitter, much like the @ sign. While @ is used to denote @replies, the # is used to denote #hashtags. A #hashtag is used to mark tweets on a given topic, allowing for that topic to be searched for easily.

For example, tweets about WikiAnswers may have a #wikianswers tag, while tweets about the Nintendo Wii use a #wii tag. Most Twitter clients, including the site itself, automatically detect #hashtags: if you click on a tag, a search of that tag will automatically open.

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16y ago

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