I use both, although I don't subscribe to the Mudcat page on FB. I like Facebook because the only personal prejudices I have to cope with, are my own. I don't have to avoid criticising those who obviously are too thin skinned to cope with any whiff of disagreement, and................I can ban posts form disagreeable people.
If I complain to the management of FB I get an acknowledgement of said complaint, and either it is dealt with as I ask, or I get an explanation as to why it is not actioned. This reply is couched in neutral terms, and no personal points are made in passing.