The Brotherhood of the Black Flame of Lucifer on Facebook

[Zankou]

Yeah, I tried to join The Brotherhood of the Black Flame of Lucifer Group on Facebook and it said membership is restricted. Who do they let join them? I know they are an order of chivalrous Satanic knights, so that definitely sparked my interest. I am already part of a group on Facebook called Spiritual Satanism, so my question is that is The Brotherhood of the Black Flame of Lucifer like a secret society or something?