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Twitter CEO Jack Dorsey had his Twitter account hacked earlier today. Twitter is investigated the compromise of Dorsey’s personal account, the company said in a tweet, and later said the hack was the result of a “security oversight by the mobile provider.”

A group called the Chuckle Gang used the account to send tweets to Dorsey’s 4 million followers to promote a Discord server and use racial slurs.

Those tweets were erased, but it appears they were sent from an app called Cloudhopper, an SMS service acquired by Twitter in 2010.

Hackers that managed to break into accounts for Google CEO Sundar Pichai and Facebook CEO Mark Zuckerberg also got a hold of Dorsey’s Twitter account in July 2016.

In 2012, Dorsey said he hacked an email server to get his first job.

VentureBeat reached out to Twitter for further information but a spokesperson declined to provide additional information.

Updated 8:55 am August 31 to include additional explanation from Twitter.

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