Our goal was to create and evaluate Elemi, an “exoskeleton for the mind.” In short, Elemi is an AI-powered intelligent support system designed to augment metacognition in social media environments. Built with and for the public, Elemi helps people grapple with the misinformation crisis online by leveraging a range of evidence-based realtime strategies, from blurring out known misinformation to prompting reflection before consuming suspicious content.