The first Tweet in history was sent by Jack Dorsey on 21 March 2006. At least the Twitter co-founder didn’t go overboard for the occasion, simply tweeting: “just setting up my twttr”. But that didn’t stop this Tweet being auctioned off for an astronomical sum... in 2021, Sina Estasvi paid $2.9 million to own it! In practical terms, it’s not exactly clear how someone can own a Tweet. But Jack Dorsey did pledge to donate the money to an NGO, which is nice.