This plugin became... very limited since 1.1.3 update :P
Menus and usability of this plugin have changed. Now it's impossible to decide what pages can receive a social box from this plugin. It appear everywhere in the website as soon as it is activated, by pages or posts or whatever I choose.
I wanted to activate the comment box, just for some pages, but no more individual menu per page/posts, all became just "general same options" for ALL pages/posts, etc. Worse, The comment box appear everywhere, even on pages I deactivate the comments... (like homepage, contact, sitemap, etc.)
So, I keep it installed but deactivated, just to receive updates... And I don't really code, so I'm using plugins and all of them (+20) works just fine.
Only this one official Facebook plugin is "capricious" (since 1.1.3 update) and it is not because of bad coding.