According to anonymous sources speaking to TechCrunch, private messages from Facebook founder Mark Zuckerberg have mysteriously disappeared from their Facebook Messenger inboxes. If you’re a user of Facebook Messenger, then you might be aware that while you can delete the messages that you send, that only removes the message from your copy of the conversation — anyone else in the conversation is still able to see it, whether that be a one-on-one or group conversation.