Fix Facebook incorrect WordPress Thumbnail
Many things can stop Facebook from correctly guessing which thumbnail to use for posts and pages in WordPress. Facebook uses open graph (og) tags to show your content on its platform. One reason for this issue could be having multiple images set in the og:image tag, where your featured image is smaller than your other images. This is easy to solve with a WordPress SEO plugin like All in One SEO. It will automatically add the correct open graph tags to your site, preventing the missing thumbnail issue. First, you’ll need to install and activate All in One SEO. Next, you’ll need to turn on the function that allows the plugin to add Facebook thumbnail images to each post. To do this, go to All in One SEO » Social Networks . Then, in the Facebook tab, turn the Enable Open Graph Markup toggle to the “on” position. Beneath that area, you can select a Default Post Image from the drop-down menu. This will typically be your Featured Image...