tangor - 8:29 am on Oct 27, 2011 (gmt 0)
Agree with the pre-moderation idea... but that's a lot of work. HOWEVER, if there's a landing page/index that is semi-static, let google have that and deny the forum itself is another alternative. Sounds self-defeating, but it actually works. I've used that method on several sites on various topics which occasionally garner weird, crazy, even offensive, speak.
BUT, even with a deny in place for the gbot... if a thread has been linked elsewhere the gbot does come... so at best, one can only SLOW or DELAY entry into the Greater Index In The Cloud-Like Sky.