Bill,
I am having the same problem as you.
I started two different facebook apps for two different mapped domains in a Multisite install.
I keep getting this error in reference to my mapped domains.
I am not using DNS subdomains. I am using this format for my domains before they are mapped: http://www.xxxxxxx.com/sitename
Facebook won’t let me input this format into the app domain or site url boxes.
I’m not sure what to do!
Justin
I can’t find the download link on your page and it is saying the plugin file is not available every time I try and download it from my plugin system.
Thanks for all the great work.