Image does not appear when sharing on social networks

When I share a post, product, or page, the featured image is not displayed on social networks. I tested on Facebook and Google+.
What could this problem be?

Hello,

Here is an article that should help you to fix facebook share images issue http://www.wpbeginner.com/wp-tutorials/how-to-fix-facebook-incorrect-thumbnail-issue-in-wordpress/

Regards

If anyone needs it. Worked perfectly with the plugin “Facebook Open Graph, Google+ and Twitter Card Tags” https://wordpress.org/plugins/wonderm00ns-simple-facebook-open-graph-tags/

Thank you very much for posting your solution here.

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