Just FYI in case this helps someone. My client asked me why there was erroneous code over some pages. To cut a long story short, enabling the "Like" button caused bad Open Graph code to be pumped into the site HEAD area, breaking the HTML. Fix is to shut that off.
I really couldn't say if FB is at fault (due to their inherent evil) or the plugin.
This was difficult to track down because the erroneous code generated is seen on practically every HTML element on a page. And yes, we have the latest TS plugin as of this writing.