The whole Internet woke up and upgraded their iPhone this morning. See, Facebook 'Places' was part of the new update (which I quickly built a privacy shield around as I was really just wanting to upgrade the increasingly buggy app). Even if you wanted all your friends to know that you were at Rawhide, you can't. The error message you get is at left. A quick confirmation of the Facebook friends finds similar results from other New Yorkers..
Granted, this is only New York City. We're still trying to get In-N-Out Burger, too.
UPDATE: About eighteen hours after the launch, it now works!