Oftentimes you can deny the post ability. You can't tell until you arrive at the screen, but if you don't click okay, nobody's posting anything on your wall.
That's the real problem here: Facebook has a history of wanting to expose as much personal information as possible, including exposing information that was previously not exposed without warning. I don't necessarily distrust the OP's business today, nor do I necessarily disagree with the permission settings I can set today. What I don't trust is Facebook's future changes to those permission settings, nor what the OP's business is going to do when/if it has more access to my information than it used to have.
If Facebook had a history of strong privacy protection and strict opt-in policy to information sharing, this wouldn't be so bad. But since Facebook has the completely opposite history, including Zuck coming right out and saying that he would prefer all Facebook user info to be shared, I'm not going to trust Facebook to keep whatever I want private private.