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Now used as a symbol to identify a group of tweets around the same topic, the hashtag, or pound sign, has a fascinating history, as Ben Panko reported for Smithsonian.com last year.—Julissa Treviño, Smithsonian, 24 Apr. 2018 Now the social media company is witnessing the power of the pound sign firsthand.—Hugo Martin, Los Angeles Times, 15 Oct. 2017
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