I have a very strange problem with this plugin:
The Facebook Box is only appearing when I also load the buttons from the AddThis plugin. I assume, since Facebook is among the AddThis buttons, this adds something?
On my homepage: http://www.myrkothum.com/ there is the Facebook Box missing on the sidebar.
On any article page, where I have AddThis enabled, the Facebook Box is also shown: http://www.myrkothum.com/self-discipline/
I tested removing the Addthis from the article page, and then the Facebook Box is gone too.