From Facebook Developer Wiki

Hey, Thanks for mentioning the profile.setFBML issue on the wiki. What's happening is you're using a client that has to be updated (on our end, <sigh>). We deprecated the $profile_action on the new profile. And you're right, that param does come before the $mobile_profile one. In the meantime, pass NULL there.

Sorry for the confusion.

--Pete 563683308 14:57, 31 October 2008 (PDT)