Learn how to use Facebook's Open Graph protocol to mark up blog postings and other webpages for sharing on social media. Senior staff author James Williamson shows how to add Open Graph tags to blog posts and define elements such as the post title, URL, site name, and publish date. He also demonstrates how to add a preview image, description, and author credits, and test your work. With these techniques, you control how any webpage displays when it is posted, shared, or liked on social media.