I updated the Jetpack plugin to 2.1.2 a few days ago, but just noticed after publishing an article that the sharing function had disappeared. I reverted back to 2.1.1 and it works fine. Not sure what's causing the issue.
Perhaps someone could take a look at the site (http://BlakeDesignSolutions.com) to help diagnose the problem? If you can contact me (preferably closer to the weekend), I'll reinstall 2.1.2 and let you take a look.