I think GF stood for Gear freakz may be wrong. Badham created that private forum after many vets were looking for a safe place to meet and be free from the tyranny of anabolex.
He even had a private forum in GFS that is how seriously he took security at the time.
I think it was Gear Freakz as well...i'm not 100% certain though. Other will know for sure. I didn't join there (or invited) until many years after Bad opened it. It had already slowed down quite a bit by time I got there. It had a great search history though and some of the best members on the forums had run through it at some point or another.
I was on a ton of forums during the early to mid-2000's, but did not post too much on most of them. Due to time constraints from college and work (earlier 2000's), I mostly posted on EF, AF (Both Anabolic Fitness and AFboard), Iron Trybe, CEM a little, Intense-training a little, Animal's a little, and a few others. This was after i came back to the forums 99/2000 onward. I was at others but only had limited time to post. The later 2000's onward i started posting more other places.