The Secret to Getting Large Facebook Link Thumbnail Image Sizes
Want a large Facebook Link Thumbnail? You need a BIG blog post image. Learn the minimum and optimal image sizes so you don't get a teensy link thumbnail.
16 Mar 2020 ... How to share a link with preview on your Facebook Page ... If your blog post image isn't big enough, then it will render as 154 x 154 or 90 x ... to be used by Facebook if there are several in an article using Open Graph code.