Take the 2-minute tour ×  I have implemented FBConnect into my
iPhone App, and it works perfectly on the Simulator (v4.3).
However, when I test the the same code on my iPhone (v4.3.3), it
appears as though my Facebook Button now exits out of my
application and opens the Facebook App. The Facebook App
displays a page saying I have already authorized my app, and
that I should press "Okay" to continue. At first I did not think
this was necessarily indicative of a problem, but when I hit the
Okay button, I am simply returned to my appViewController where
I clicked on my Facebook Button in the beginning.  What I
expected, and what occurs correctly in my simulator, is that a
smaller Facebook subview window would appear in my application
view after clicking the Facebook Button, and I would be given
the option to publish to my Facebook Wall.  I should mention,
that I have successfully been able to run the "DemoApp"
(facebook-ios-sdk test program) on my iPhone. Also, my app does
not crash and no errors are reported in