I also have an account on the Undercroft as well as here on LttD. Like Magister Nemo I feel that these two mediums of communication are more Satanically exclusive and superior to that of Facebook. But alas, the vast majority of users have migrated to FB and now seldom haunt this old lair as they once did.
Quite honestly, if you are looking to interact with a much greater number of like minded individuals, you would get more mileage from the CoS unofficial FB group:https://www.facebook.com/groups/thechurchofsatan/
Just a suggestion.