I've got to agree with
good times and
LikeMinds on this one (which, after 4+ years, I've figured out is a pretty good team to be on

).
As to the FB and swing friends issue:
We have quite a few swing friends on our FB accounts. Now, our FB accounts are 100% totally vanilla, and that is made clear before we friend any of our swing buddies. Their FB pages are much the same, so there isn't any lifestyle drama to worry about. I really don't worry too much about what comments and dialogue my FB friends get and receive from each other.
So, I really don't see an issue with swing friends being on FB, as long as everyone is on the same page.