Twitter chief Jack Dorsey is the latest high-profile tech boss to have his account compromised by hacking group OurMine.
Joining the likes of Facebook's Mark Zuckerberg and Google chief Sundar Pichai, Dorsey was targeted by the cyber attackers on Saturday morning (9 July), with the group taking over his Vine account and sharing the content to his Twitter feed.
The hackers posted several video clips, as well as a tweet reading: "Hey, it's OurMine, we are testing your security" with a link to the its website.
The messages have since been erased, and while it's not yet known how the hackers got access to Dorsey's accounts with previous hijackings the group has reportedly found passwords in stolen data dumps from LinkedIn.
Over recent weeks the group has gone on a Twitter hacking spree, also targeting Uber chief executive Travis Kalanick and former Twitter chief executive Dick Costolo.