A client's site is set up to use comments on pages, instead of posts in categories. I know, totally screwed up, but it's too late to turn back. This means new content is not in the form of a new page or post, but a comment on an existing page (which I made push onto FB by setting to draft and back to published).
No idea if this can be done, but they are looking to post NEW COMMENTS to their Facebook page. Yes, your plugin does this as promised, but does not reorder the posts on Facebook.
In other words, if someone comments on a page that was published on a certain date a way back, it will not show up as new activity, at or near the top of the feed.
Other than starting over from scratch, which I recommended but they are unlikely to do ... Any suggestions?