What are non-fungible tokens (NFTs) - and why are they selling for millions?

The latest digital craze sees Jack Dorsey’s first tweet sell for $2.9m

Jack Dorsey
Twitter co-founder Jack Dorsey

Twitter’s first ever tweet posted by co-founder Jack Dorsey has been sold as a non-fungible token (NFT) for the equivalent of $2.9m (£2.1m). Auctioned off for charity, the tweet published on 21 March 2006 simply reads: “Just setting up my twttr.”

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Mike Starling is the former digital features editor at The Week. He started his career in 2001 in Gloucestershire as a sports reporter and sub-editor and has held various roles as a writer and editor at news, travel and B2B publications. He has spoken at a number of sports business conferences and also worked as a consultant creating sports travel content for tourism boards. International experience includes spells living and working in Dubai, UAE; Brisbane, Australia; and Beirut, Lebanon.