Looking at the latest Facebook apk (1.6), it looks like both "facebook://" and "fb://" are registered protocols.
facebook://
facebook:/chat
facebook:/events
facebook:/friends
facebook:/inbox
facebook:/info
facebook:/newsfeed
facebook:/places
facebook:/requests
facebook:/wall
fb://
fb://root
fb://feed
fb://feed/{userID}
fb://profile
fb://profile/{userID}
fb://page/{id}
fb://group/{id}
fb://place/fw?pid={id}
fb://profile/{#user_id}/wall
fb://profile/{#user_id}/info
fb://profile/{#user_id}/photos
fb://profile/{#user_id}/mutualfriends
fb://profile/{#user_id}/friends
fb://profile/{#user_id}/fans
fb://search
fb://friends
fb://pages
fb://messaging
fb://messaging/{#user_id}
fb://online
fb://requests
fb://events
fb://places
fb://birthdays
fb://notes
fb://places
fb://groups
fb://notifications
fb://albums
fb://album/{%s}?owner={#%s}
fb://video/?href={href}
fb://post/{postid}?owner={uid}1
Sorry if I missed some... only played with a handful of them in the emulator to see if they actually work - a bunch of them will cause the Facebook application to crash.
1 where postid is in the uid_postid format, e.g 11204705797_10100412949637447
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