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
Part of Media · Watch in the documentary