As an editor I want to be able to select an image from the GPI media library without having to worry about whether its size is appropriate for social media (og:graph).
Large images of several thousands of pixels wide/high are ignored by various platforms (incl. Twitter and FB)
A suggestion is to either auto-resize upon selecting an image as an og:graph image, or to generate medium sized version per default and allow for editors to select which size to import.
