If you're reading this, you're probably not dead. But Facebook might think you are.

Facebook (FB) notified some users on Friday that they are deceased, according to widespread reports across social media.

Many people are seeing a banner on certain profiles that reads: "We hope people who love [Mark] will find comfort in the things others share to remember and celebrate his life."

Not all profiles were affected -- I'm still alive according to my pulse and Facebook. But at one point, even Facebook CEO Mark Zuckerberg was declared dead by his own social network.

https://twitter.com/bydanielvictor/status/797176007753105408

It's unclear what caused the mass obituaries, but it was likely a bug in Facebook's system.

"For a brief period today, a message meant for memorialized profiles was mistakenly posted to other accounts," a Facebook spokesperson said Friday afternoon. "This was a terrible error that we have now fixed."