I have been experiencing the same issue of Facebook posts not including the title, description, and thumbnail. They just show a gray box that simply has my website address listed twice (once as the headline and again as the description. When I use the WordPress share tool embedded within the tool I get the title and description, but I do not get the thumbnail.
This seems to be related to the main social media integration issues I am experiencing. This includes not having my social media icons appear in the header and footer, not being able to integrate my social feeds through Settings>Sharing>Publicize (I’m getting Error code: -10520).
I entered this custom css as you instructed, but that did not work. Your assistance is appreciated.
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