I use Yoast SEO v3.1 and with your plugin all work fine, none alert message i have.
I only wish you add one option
delete checkbox if someone want or not comment showing on fb wall.
if he commoents smth on wp web its mean it was importend to show on his fb wall too.
Or just give to us/admins option to chosee if we want this checkbox show or not
sorry for my english but its my x languge...
And last thing.
I would gladly supoort yoy showing my site use your plugin but:
not under the comment box (now it is very ugly) , but i prefere smth like
many,many other sites: powered by and realy nice small logo.
Evry should think about nice looking of the sites...