The FBJS tag which had been in beta for the past month or so in now live. All Facebook applications can now utilize Javascript. Facebook also has a built in AJAX object that enables developers to build all the AJAXy goodness into their applications that they’d like. The one pitfall is that you can’t use javascript includes. While easy to workaround, it is one difference from standard web page.

Slowly but surely, Facebook is providing developers with limitless capabilities through building out their feature set. Any competing platform is going to have to go through the same evolution which means that Facebook is going to maintain their position as the platform leader for the foreseeable future.