I doubt it. Just 2 days ago I had someone register through facebook at my forum, and I see people register here with profile pictures from facebook all the time.
Facebook Developer Community / Emil Hesslow You said that the hosting provider said that it is not their fault. Have you talked to the people that actually wrote the code? I'm 99.9% sure that the UniqueID error is not from Facebook
http://blog.vanillaforums.com/facebook-application-for-vanillaforums-sso/ Have you followed the steps described here? One thing to look out for is that your app is public and not in "sandboxed" mode (see step 8)