https://el.wordpress.org/plugins/facebook-auto-publish/

https://www.wpbeginner.com/beginners-guide/how-to-automatically-post-to-facebook-from-wordpress/

https://www.quora.com/Is-there-a-way-to-auto-post-to-WordPress-from-a-Facebook-page

https://developers.facebook.com/docs/plugins/embedded-posts/

https://www.social2blog.com/