Bid of $2m for Twitter boss' first post

The world's first ever tweet, posted by Twitter co-founder Jack Dorsey, has been put up for auction and it's drawing big bids.

Dorsey's tweet is for sale as a non-fungible token (NFT) and on Sunday had received an offer of $US2 million ($A2.6 million).

The post, sent from Dorsey's account in March of 2006, says: "just setting up my twttr".

It is for sale on the website Valuables by Cent, a tweets marketplace.

NFTs are digital files that serve as digital signatures to certify who owns photos, videos and other online media.

The $2m bid comes from Justin Sun, a Chinese cryptocurrency and tech entrepreneur. Sun made earlier bids of $1 million and $700,000.

Old offers for the tweet suggest that it was put for sale in December, but the listing gained more attention after Dorsey tweeted about it on Friday.

Launched three months ago, Valuables compares the buying of tweets with buying an autographed baseball card.

"There is only one unique signed version of the tweet, and if the creator agrees to sell, you can own it forever."

A tweet's buyer will get an autographed digital certificate, signed using cryptography, that will include metadata of the original tweet, according to the Valuables website.

The tweet will continue to be available for the public to see on Twitter.