I am desperate for help with this issue. I am on the verge of tears, I have been trying to fix this for months and have tried so many things in combination I'm struggling to keep it straight in my head.
I have added og meta tags, inserted new code in the header and/or functions, tried plugins, every piece of advice I can find. I still cannot get thumbnails to display on my links when posted on Facebook, and it is really affecting my traffic. If a link doesn't have an eyecatching thumbnail, most people don't seem to bother clicking it.
If anyone would be willing to help me, I would be so so grateful. I can provide copy of code and links etc.