Hypothetical: Facebook Live Prank Gone Wrong

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Suppose you're a software engineer, and you're on a video call with your friends. You accidentally leave your Facebook Live session open, and your friends start sharing your private video with your entire friend list. In the meantime, a prankster joins your live session and shares a defamatory comment about your ex-boyfriend, which is seen by over 100 friends. The comment damages the ex-boyfriend's reputation and causes him emotional distress. What would be the legal outcome under the Law of Torts? Would you be liable for damages? Can your friends who shared the video be held responsible?