The last thing any forum wants is to have:
1) Their own users spending even more time using Facebook instead of on their site
2) Facebook ads being displayed instead of their own revenue generating ads
3) To have to deal with even more data sharing and privacy issues
4) another site that doesn't feature the entire offerings their website offers, e.g. I have a Wordpress blog, an expert database, etc. none of which will be integrated.
I have a forum and a website. There is a Facebook integration already. Going to my website is as easy as going to this integrated one. Yes, it is pretty cool from a programming standpoint but I can't understand why, as a forum owner, I'd want to have my users using it. This is yet another gimmick that was likely created pursuant to executive order which was spawned as such: "It doesn't really matter how useful it really is at the end of the day - once you say "Facebook app" these forum licencees will come running with their credit cards already out..."