Details from more than 500 million Facebook users have been found available on a website for hackers.
Facebook CEO Mark Zuckerberg's cellphone number is reportedly among the leaked personal data.
Zuckerberg's name, location and marriage information, date of birth and Facebook user ID were among the trove of stolen personal data published on a hacker forum on Saturday, cyber researcher Dave Walker confirmed.
Facebook co-founders Chris Hughes and Dustin Moskovitz also had similar personal details included in the leaked data.