The uid parameter in fb:if-is-app-user is optional.
The uid parameter in fb:if-is-app-user is optional.

codeodor/facebooker,rmatei/facebooker,aotianlong/facebooker,phallstrom/facebooker,aotianlong/facebooker,codeodor/facebooker,phallstrom/facebooker,rmatei/facebooker,Flameeyes/facebooker,mmangino/facebooker,mmangino/facebooker,Flameeyes/facebooker