The # sign, used in Twitter to mark a keyword or topic. Hashtags can be used to categorize Tweets around a common topic and are searchable. If you click on the word used in a hashtag. that will also function as a search, showing you all of the Tweets using that hashtag. In addition to functional use, hashtags are often used rhetorically in Twitter and in other venues, to comment on the message: #sosickoftraffic, #wearesooutofhere.
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