Facebook Messenger and Instagram are adopting "Vanish Mode", a Snapchat-like feature for disappearing messaging. The feature, allows users to set chats to automatically delete after the message is seen and the chat is closed.
When enabled, messages sent (text chats, emoji, pictures, GIFs, voice messages and stickers etc) while in vanish mode will disappear as soon as you leave the conversation. And, like Snapchat, you'll be notified if the person you're chatting with takes a screenshot of a conversation.
To be clear, Vanish Mode is not designed to cater to those looking to secure an entire conversation. Though the feature is end-to-end encrypted, Facebook already offers a fully end-to-end encrypted conversations feature (Secret Conversations) which requires several steps and setting a timer for each message to disappear individually.
However, unlike on Snapchat, Vanish Mode is not a default setting. Vanish Mode is an opt-in experience — meaning you can can choose whether to enter a Vanish Mode chat. And it only works with people you're connected to, Facebook says.