Learn to build a face detection application using React.js and the free JavaScript library face-api.js in this comprehensive tutorial video. Discover how to implement face recognition, real-time face landmarks, and expression detection. Follow along to create a Facebook-inspired post-sharing app that allows users to tag friends in photos. Explore topics such as integrating face-api.js with React, detecting faces and facial features, and developing a user-friendly interface for tagging friends in images. By the end of this 41-minute tutorial, gain practical skills in facial recognition technology and React development to enhance your web application projects.