Also post on Facebook

Hello,
I have asked this question elsewhere – perhaps in the wrong spot so apologies.
The plugin is very good and I have had my first response and moderation worked well.
It would improve sharing if the ‘Also post on Facebook’ box was ticked/checked by default.

How can this be done?

Thanks – appreciate your product.

Regards,
Tim

https://www.ads-software.com/plugins/facebook-comments-plugin/