Hi Carl,
For the record, the share bar is at (and soon to be removed from) packages/acs-subsite/lib/share-bar
They aren't active by default, out of consideration for use cases like this.
The OpenGraph meta tags are active by default, but they do not leak any more information than is already available from the same page content/resource_url: title, favicon.ico, domain, url.
Anyway, they're on their way out.. into a package.. maybe facebook-api, ecommerce, a new package? anyway..
cheers,
Torben