I am getting this message for all WP sites as of today:
Unable to like this object because it is not accessible (it may have been removed or you may no longer have permission to see it).
Facebook Comments appear on site, and on my page. But I can't like or comment. Share is completely gone.
Also (this has been always) the first Facebook comment on a post (on the WP site) never appears right away like the following one after that. (It's always the first one.) The user does not see his FB comment until he refreshes (which of course she/he wouldn't know).
Other than that....love. :)
Thank you in advance,