Hi, we're using the component + plugin (since this december) but to date haven't had any success posting to facebook,
we've followed the guides, looked in the forum, but the only test we've managed to publish was with a certainly strange method,
using 'normal' method, create app in development, add permissions, OAuth redirection valid from component channel editor, then create content. When saving articles the Joomla indicates 'post successful', and the post gets sent to Facebook but only the user that configured the app on facebook views the post, even other page admins (fb page admins, that have not created the app on fb, but can edit content on the page) cannot see this posts, also public users (that visit the page) cannot see the posts either.
then, the 'strange' method that worked for us,
using the facebook app in development, save article from Joomla and then make publish app in facebook, only THEN the posted link gets public and other users are able to see it.
It maybe work like this but it's not an automated method, furthermore, we cannot ask the web administrators to enters developers.facebook.com every single time they publish new content to unpublish-republish the app in order to not to get errors when posting but to have the posts available to general fb public,
any help in troubleshooting this behaviour would be greatly appreciated,