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Compie 10 anni l'hashtag, un simbolo nato per etichettare le frasi agli albori di Twitter e diventato, negli anni, la bussola social che indica argomenti e notizie di tendenza. Il primo è stato usato il 23 agosto 2007 e ora, a un decennio di distanza, sul microblog ne vengono twittati 125 milioni al giorno.
A partire dal quel tweet, l'hashtag si è evoluto ed è diventato parte del linguaggio comune. Il suo significato oggi è conosciuto in tutto il mondo, così come la sua funzione: un filtro grazie a cui, nella ininterrotta cacofonia dei cinguettii, si può far emergere la melodia che vogliamo ascoltare.
Cercando un hashtag su Twitter riusciamo infatti a leggere solo i post su un determinato argomento, sia esso la partita di calcio o un attacco terroristico. Non solo: guardando ai "trending topics", cioè agli hashtag più usati in un certo giorno in un paese o una città, abbiamo l'elenco dei fatti che più hanno attirato l'attenzione dei cittadini.
ATS/sdr
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