Enlarge / An AI-generated image released by xAI during the open-weights launch of Grok-1. (credit: xAI) Elon Musk-led social media platform X is training Grok, its AI chatbot, on users' data, and that's opt-out, not opt-in. If you're an X user, that means Grok is already being trained on your posts if you haven't explicitly told it not to. Over the past day or so, users of the platform noticed the checkbox to opt out of this data usage in X's privacy settings.