Meta (formerly Facebook) released a major update to Messenger, to provide support end-to-end (E2E) encryption in group chats and calls. The feature extends Messenger's existing encrypted E2E messaging feature by now allowing you to encrypt group chats and calls. 
Along with encrypted E2E group chats and calls, Messenger's latest update brings alerts in case someone tries to take a screenshot on messages (πριν η ίδια mode was only available in Vanish function, which deletes messages when read).
For those who do not know, Messenger has been offering support for end-to-end encrypted chats for some time. The feature was first released in 2016 and as of today it finally supports group chats and calls. E2E encryption in Messenger is currently a feature that you can select by tapping the lock icon when starting a new conversation.
E2E encrypted messages are not the same as the secure Vanish feature available in Messenger and the Instagram, as messages will not be deleted by default. However, it will notify you if someone takes a screenshot of a message. Surprisingly, Meta's WhatsApp messaging service still doesn't notify users if someone takes a screenshot of a message.
