Well, I know, that FB is not uses so MySQL is. But ie. on my site
(http://www.id3renamer.com) I'm using FB without any problem. :D And now I
want to try some forum (the old forum there is based on MySQL) based on FB.

I've read, the phpBB is starting to use FB too, but it's still in
development stage. :(

I hope there's any (stable) PHP forum with support for FB database. ;)

--
Jiri Cincura
http://www.cincura.net/