Digg Digg is among the most popular free social sharing plugins available for WordPress sites. The plugin adds a floating bar with sharing buttons to your WordPress blog, just like Mashable. Now this tutorial is on another new WordPress plugin called Evolution Social Share. It is advertised that theb plugin is an alternative to Digg Digg that uses less code and loads much faster. Provides you fixed social share toolbar that is SEO friendly and customizable.
Install and activate Evolution Social Share plugin. Upon activation you can control its options, features and make customization from your admin area Dashboard -> Settings -> Evolution Social Share page.