Check out Share It at joeworkman.net/rapidweaver/stacks/share-it
Share It is a uber cool share button for you website. When you hover over the customizable button, four share button animate out onto the webpage. Share It supports all of the most popular social networks: Facebook, Twitter, App.net, Google Plus, Pinterest, LinkedIn and Email. You can even customize the share buttons to use your own favorite site. As most of our stacks, Share It offers a ton of customizations.
Check out the documentation for features that may have been added or changed since this video was recorded.