It was either Twitter, FB or on some other Blog format. It was more than simply a reply on some message board. I remember it being short & (un)sweet, so that's why I can only say "twitter, I believe." I didn't mean to imply in my wording that I wasn't quite sure that he did send out a social media text slamming the Pope hire.
He did in fact. As CougarTailDevourer states — it IS very possible, despite your valiant research to prove to the contrary.