Twitter CEO Jack Dorsey has sold his first-ever tweet for $2.9 million (₹21 crore) as a non-fungible token, or NFT, on Monday. The tweet, which reads, "just setting up my twttr", was first posted by Dorsey on March 21, 2006. NFTs are digital assets, including jpegs and video clips, that can be bought and sold, just like physical assets.