The account of Twitter's CEO and co-founder was hacked for a short while before being secured.
Public tweets and retweets including racial slurs and swear words were sent from Jack Dorsey's account on Friday night.
They appeared in the feed of his 4 million followers before Twitter eventually secured the account.
The tweets and retweets were deleted less than an hour after the breach.
In a statement, Twitter said the phone number connected with Dorsey's account was compromised because of a security oversight by the mobile provider.

Indonesia fire kills 16 people in retirement home
China launches war games around Taiwan as island vows to defend democracy
At least 13 dead, 98 injured in Mexico train derailment
South Korean president vows to reveal truth on anniversary of Jeju Air crash
Trump, Netanyahu to discuss next phase of Gaza plan