Rationale: If you can share a post on WhatsApp, you could be able to auto-post it… Forgive me if I’m wrong.

https://wordpress.org/plugins/share-post-on-whatsapp/

https://wordpress.org/plugins/free-social-media-with-whatsapp/

https://wordpress.org/plugins/whatsapp-share/

https://wordpress.org/plugins/ultimate-social-media-icons/

https://wordpress.org/plugins/add-to-any/

https://wordpress.org/plugins/sassy-social-share/

https://wordpress.org/plugins/addthis/

And many more…