Facebook developer news announced today that Facebook platform now supports for external FBJS reference in FBML. This is great, since we can make our FBML code cleaner and easier to maintain by separating all FBJS codes into other files, or maybe other server.
Don’t be too excited though, this is FBJS that can be external, not Javascript. It means that you still can’t use Prototype, jQuery, YUI and other javascript framework out there when you’re using FBML.