I think that it would make things much simpler if the forum and the social networking site were hosted on the same network - it would cut down the number of passwords and screen names needed. I believe the forum, will complement the social network - as a place where every one can get together. Personally - I adore the chat box - and I think the combo of the chat box and the forum on the site will help us all get to know each other much better.
So - that's the long form of the next comment
I think moving the forum would be a wonderful idea.