I am a great fan of smart blocks, especially for letting non-techies edit parts of the sidebars and widgets.
I just installed, per request, the new(?) facebook plugin and I have to jump through hoops to let the 'likes' etc NOT display on (all) Smart Blocks. The plugin has a feature to disable for pages, for plugins, or to do it per 'post'. However, this panel is not shown on the Smart Blocks page, so there is no way to control it.
As your Smart Blocks is an (very good) addendum to the CMS categories (post, links, pages,..), I thought of starting at you first. ;-)
I currently fixed it by making sure a 'display:none' style is added to the appropriate fb-styles on my facebars.
Thanks for the great plugin!