Mark Zuckerberg is warning Facebook Messenger users not to screenshot private chats. Messenger now shows a notification when someone captures a disappearing message in certain conversations.

Facebook introduced “Vanish Mode” in 2020 for Facebook and Instagram. It made messages disappear after the recipient viewed them and left the chat. Facebook explained: “Sometimes a message is just spontaneous – something you want to say in the moment without worrying about it sticking around. That’s why we’re excited to introduce Vanish Mode on Messenger, which lets you send messages that disappear automatically.”

Facebook’s Help Center now says Vanish Mode is “no longer supported,” but disappearing messages still exist. The Help Center notes: “Disappearing messages are gradually being introduced and may not be available to you yet,” and the setting can be found in Messenger under Privacy and Support.

The key update is the screenshot warning. Messenger states: “If someone takes a screenshot or screen recording, a notification will appear in the chat.” Zuckerberg announced: “New update for end-to-end encrypted Messenger chats so you get a notification if someone screenshots a disappearing message.”

Zuckerberg demonstrated the feature by sharing a chat with his wife, Priscilla Chan, where a screenshot triggered the alert.