In the early days, Facebook was almost entirely text (posts) and links. It was rare for you to come across a small image and almost all of them were representative images.
Extremely Standard Facebook Image Size To Optimize The Effectiveness Of Online Advertising
The size of Facebook images to run ads on social networks is the information that designers need to know in order to design images appropriately. Knowing the size of Facebook images, the new design department can collaborate seamlessly with marketers in effective social media planning
https://hudareview.com/standard-facebook-image-size/
