When you’re posting your link to facebook you will notice that it can pick up any random image to use for your post. So what you want to do is have the ability to decide on a base image for Facebook to use. Most people do it as a site logo that encompasses everything for your site.
With the plugin: Theme Companion open it up and click on the [Add HTML code to the <head> area] – When you are in that area to edit add this line:
<meta property=”og:image” content=”http://urlpathtoimage.tld/image.jpg” />
In this case it’s:
<meta property=”og:image” content=”https://frumph.net/images/header/frumph.png” />
Where https://frumph.net/images/header/frumph.png (the urlpathtoimage) points to an image that I want to use for facebook to recognize.
And that’s it, next time you post something to Facebook, the base image ^ the one you pointed to in the content= line will be used as the image for your feed on facebook.
– Phil