https://www.techradar.com/news/facebook-hack-leaks-data-from-50-million-users

Earlier this week Facebook discovered a breach in its security that compromised the data of nearly 50 million accounts. The announcement that the breach occurred was made on Friday and while authorities have been contacted, but Facebook has yet to discover where the attack came from or the full scope of it.

The breach was discovered by Facebook’s engineering team Tuesday morning and, according to a post on Facebook’s newsroom, the company says that 90 million users were forced to log out and log back in to verify their credentials.