To paraphrase Mr Jobs...
"There's an add-on for that..."
I've just added an add-on, to my already straining Firefox, to block all these third party "like" buttons - for all the "off by default" bromides fed to us, I reserve the right to use belt and braces to hold up my privacy, particularly on a site that handles such sensitive data, particularly where the lining up of anonymous visitors and nonymous tracking data is so utterly trivial, and even more particularly on one of those marvels of the modern programming, the public sector IT project - which normally have more bugs than a tramps backside.
Thank heavens for add-ons.