It's not working.
This is Facebook's response to criticisms of lack of privacy--they've changed the default to "Only Me" and there's no way to make the default anything else. You can put "facebook publisher control" into GoogleNews and read an interesting CNET article about it.
In a few days someone else on the Internet may come up with a fix, but until then it's going to be belt-tightening time on the Wall. I came back to my Wall this evening to find it basically empty, because nobody saw the informational banner in-game, and so they all assumed their default was still "Friends". So all those Mystery Eggs and Wandering Stallions and Fuel...all went to waste.
This is really stupid.