Blog Design Services & WordPress Maintenance Packages
The easiest way is the Facebook Developer’s “Debugger”. Click here, paste your single post’s link into the field – pictured below, and click “debug”.
“Open Graph Warnings” indicate a problem. As well you can see that the integration failed to fetch the right image:
Navigate to your SEO settings tab, and click on the “social” sub-tab. Check the box, and add your default image and description.