Logos of Twitter and Facebook. Photo: IC

The official Twitter accounts of Apple, Elon Musk, Jeff Bezos and others were hijacked on Wednesday by scammers trying to dupe people into sending cryptocurrency bitcoin, in a massive hack.

The list of accounts commandeered grew rapidly to include Joe Biden, Barack Obama, Microsoft co-founder Bill Gates, bitcoin specialty firms and many others.

"Tough day for us at Twitter," chief executive Jack Dorsey said in a tweet.

"We all feel terrible this happened. We're diagnosing and will share everything we can when we have a more complete understanding of exactly what happened."

The Biden campaign told AFP that Twitter locked down the hacked account quickly and removed the bogus tweet.

Twitter disabled the ability to tweet from validated accounts, those with the official blue checkmarks, for about two hours while working on a fix.

"Most accounts should be able to Tweet again," the Twitter support team said in an evening update of the situation.

"As we continue working on a fix, this functionality may come and go. We're working to get things back to normal as quickly as possible."

The duplicitous posts, which were largely deleted, were fired off from the array of high-profile accounts telling people they had 30 minutes to send $1,000 in bitcoin in order to be sent back twice as much.

"This is a SCAM, DO NOT participate!" Gemini cryptocurrency exchange co-founder Cameron Winklevoss warned from his official account on Twitter.

"This is the same attack/takeover that other major crypto twitter accounts are experiencing. Be vigilant!"

BitTorrent chief executive Justin Sun is offering a $1 million reward for finding the Twitter hackers and bringing them to justice, according to media reports.

AFP