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.

Trump says no Israeli troops will go to Beirut after call with Netanyahu
Iran halting indirect talks with US over Israel's Lebanon incursion
Trump says Iran really wants to make a deal with the US
Israel's Netanyahu orders attacks in Beirut's southern suburbs
Malaysia bars under-16s from signing up for social media
