What I’m using instead is SocialSharePrivacy, which was created by the German website Heise Online and adapted by Mathias Panzenböck. The page shows a grayed-out mockup of a sharing button. You click once to activate it, then a second time to share the page. If you don’t click, nothing is loaded from the social media site, so it can’t track your visit. If you don’t care about the privacy issues, you can click on the Settings icon and enable the sharing buttons permanently.
It’s not a perfect solution — two clicks instead of one — but it’s much more privacy-friendly.