This plugin is outstanding. Only problem I have with it is when using WPTouch for generating a mobile platform for a few of my websites, the SFC is either stretching my WPTouch layout too wide (Android) or SFC is getting cutoff on others (Windows Mobile). Other than that the functionality of the plugin is functional. Some mobile usability consideration would help bring this plugin into the emerging mobile browser dominated era that is unfolding at this time.
I saw in the change log that this plugin did at one time allow for percentage based widths, but this feature was removed due to some unresolved bugs that were crashing the plugin. I think this approach should be readdressed to allow for more mobile users to utilize FB on their mobile device enabled WordPress websites.