I want to post an image with a link in the caption to Facebook from my iPhone app. I'm using the Prime31 Social Networking plugin and calling FacebookBinding.postImage() and including the link as plain text. When I include any complex URL in the caption, Facebook appears to reject the post. For example, if my caption has "www.foo.com" in it, everything works fine. But if I have something like "www.foo.com/appname/index.html" the wall post fails to appear. Does anyone know why Facebook rejects the post (I'm not getting an error message back in the XCode console)? It is a formatting issue or a Facebook policy issue? Is there a workaround?