This plugin is very powerful in terms of editing specific SEO attributes for your website.
It also provide the option to add "Social" Meta data (in Facebook's case that would be open graph)
There you can set the url to the image you want to use when somebody shares your website on facebook. After some time (not to long) you can parse your url over here: https://developers.facebook.com/tools/debug/og/obj... And see what is being read by Facebook.
Second option is using Facebooks official Wordpress plugin: https://wordpress.org/plugins/facebook/ This plugins offers the same option for adding the correct facebook meta data.
There are multiple ways of doing this I would recommend using the wordpress plugin "YOAST Wordpress SEO" (https://yoast.com/wordpress/plugins/seo/)
This plugin is very powerful in terms of editing specific SEO attributes for your website.
It also provide the option to add "Social" Meta data (in Facebook's case that would be open graph)
There you can set the url to the image you want to use when somebody shares your website on facebook.
After some time (not to long) you can parse your url over here: https://developers.facebook.com/tools/debug/og/obj...
And see what is being read by Facebook.
Second option is using Facebooks official Wordpress plugin: https://wordpress.org/plugins/facebook/
This plugins offers the same option for adding the correct facebook meta data.
+1 for Patrick's recommendation.
We use Yoast on most of our sites and the social meta works very well in most cases.
Thank you!