Thanks for the wonderful plugin that works better and offers more than the official plugin offered by Facebook!
I notice a conflict with the Subscribe2 plugin (http://wordpress.org/plugins/subscribe2/), which has over a million downloads, so I imagine I'm not the first to encounter this.
I'm only using the Publisher module with SFC. Basically, with SFC enabled, the Subscribe2 landing pages aren't updated with the correct info. For example, the subscription confirmation page should display a message like "Your subscription has been confirmed" and remove the signup form. See http://wordpress.org/support/topic/subscription-confirmation-message-missing.
Any idea how to resolve this conflict?