It's claimed hackers have stolen the email addresses of more than 200-million Twitter users.
Security researcher Alon Gal, says all the details have been posted online - calling it one of the "most significant leaks" he's ever seen.
The social media platform hasn't commented on the report, first shared on Christmas Eve.
200 million Twitter users’ email addresses allegedly leaked online - @LawrenceAbramshttps://t.co/4kldz8eh8z
— BleepingComputer (@BleepinComputer) January 4, 2023