Can secret messages be screenshot?

Only the sender and recipient can see the messages and only on one device of their choosing. However, to use Messengers end-to-end encryption feature, you first must turn it on. They call it “Secret Conversations.” Anyone can take a screenshot of your secret conversations.

How can you tell if someone has a secret conversation?

Its worth noting that if you send someone a message through Secret Conversations, they will know its a secret chat because the message bubble, which is usually blue, will be black. Next to their image it will read Encrypted from one device to the other to let both parties know theyre engaged in a secret chat.