I wrote the autor of this plugin, here is the answer (24.06.2015):
Hi,
Thanks for reporting this.
Facebook stopped providing public access to Graph API, so that’s why it’s not getting the likes. There is no way to go around this.
I may redo using the facebook first XML web service: https://api.facebook.com/restserver.php?method=links.getStats&urls=www.facebook.com/wordpress (change wordpress for other page name or id).
Maybe this next weekend I release a new version, though no certain eta, because I am full of work right now.
Best,
Gonçalo
The link is ok, I can see the Count, but how I can use it?
Hey Gonçalo,
thanks for the reply.
I figured the same about the Graph API, since all other similar WP Plugins stopped working as well.
I know how it is to get buried in work, so dont worry about it.