When your website content is shared on Facebook, Messenger and other places, the Sharing Debugger helps you understand what type of information is used to create link previews. This document covers many of the more common questions developers ask while troubleshooting their links and working with the Open Graph metatags on their websites.
Many factors go into how an image may be cropped. For example, we try to center the image around faces that we can detect.
For large images, try to keep your images as close to 1.91:1 aspect ratio as possible to display the full image in News Feed without any cropping.
Page posts always use a large, landscape image for link shares. This is the same across desktop and mobile News Feed. Try to keep your images as close to 1.91:1 aspect ratio as possible to display the full image in News Feed without any cropping.
All URLs must be absolute as they represent the canonical location of a resource (page/image), so that we can attribute shares and likes to the correct URL and cache images properly.
Changing og:title, og:image, etc. only applies to future shares of that link.
Once a person or page shares a link, and there have been more than 50 interactions with the post (comments, likes, shares, etc.), then the title cannot be changed. This is to prevent a site from changing details of a link after you've interacted with it, making it look like you were interacting with something different. All other properties can be modified at any time.
If you've shared a link and updated the image, the original share will continue to show to old image unless you refresh it in the post.To refresh the link image in a post: