Sorry. The Delcamp forum has been around a long time. The moderator is
sometimes painted as a petty tyrant; I haven't spent enough time around
there to know. It is popular, and seems to have a great deal of
Mr. Delcamp is strict about members' requirement to post something like at least two messages a month and even more strict about copyright issues. I posted my arrangement of a Puccini aria and a moderator took it down, since even though the music is clearly in the public domain, someone else had written lyrics (not the opera's originals) for it, and those were still under copyright. My arrangement included no lyrics at all.
Delcamp has also arranged and posted a large number of scores, including extensive offerings of Bach, Tarrega and Llobet, free to members who have posted a required number of messages.
You're right that the forum has a great deal of information, but much of the discussion is helpful especially to beginners. Of the many Facebook CG groups, this one: https://www.facebook.com/groups/203609713179964, has 16,000 members and a fair amount of traffic, but again most helpful to beginners. That's why I prize these usenet groups, what's left of them, since the participants tend to have been members longer and are sometimes older, and so offer more seasoned points of view.