The Social Publisher is awful. It is bad like no other plugin I have ever tried. It requires you to create a 'Facebook Application' and then 'Associate an Open Graph action-object pair for your application: people can publish an article.' Which then leads you through the innards of the FB developers site, trying to submit apps, publish actions, debug access tokens and enter secret codes.
At one point I was faced with this advice from someone:
"Make sure you have included the OpenGraph Meta Tags on each object page with the crucial og:type tag set to YOUR_APP_NAMESPACE:ACTION_OBJECT."
I gave up after an hour and a half. What on earth are FB playing at, releasing this garbage? And it says "Make your WordPress site social in a couple of clicks." Ha, that is hilarious.
And these are their official instructions... How many clicks is that exactly? https://developers.facebook.com/wordpress/