What is the issue?
When pages do not contain Facebook Open Graph image, description, and title data, it can result in your shared posts having an unattractive appearance on Facebook and therefore might not drive as many engagements or clicks.
How to fix
Add descriptive Open Graph tags to your web pages. This can usually be done directly in your CMS or via plugins. If not, pass the information on to your developer or technical team. Learn more about this here.
Use number of sessions from Google Analytics to find which pages and more popular with your website visitors. These pages are more likely to be shared on Social Media channels, so you should prioritize these pages by adding Open Graph data to them first. Learn more in this article.