2006
Jack Dorsey, co-founder of Twitter, who sent the first tweet ("just setting up my twttr") on March 21, 2006. Jack Dorsey sends the first tweet, "just setting up my twttr", on March 21, 2006. The 140-character format is a constraint inherited from SMS; the @ reply and # hashtag conventions emerge organically from user behavior in 2007-2008. The site becomes the global breaking-news layer.
Source: Wikimedia Commons
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