Last week, we reported on Facebook’s worst-ever security breach. As many as 30 million users have been affected by the breach and hackers have successfully accessed 29 million of them. Even so, hackers weren’t able to gain access to any third-party app data, something that could have had even more serious consequences. Facebook published a blog post to give more details. Here’s what we know…

For 15 million users, usernames and contact information was compromised. For another 14 million users, additional information was accessed, including education, work, gender, religion hometown, and more. Private messages, it appears, were not hacked. Still, this is a huge deal for Facebook. If you want to check to see if you are one of the 30 million Facebookers hacked, you can do so by accessing their Help Center.