We’ve just enabled a plugin for all bloggers that lets you share your posts with Twitter, Facebook, and a host of other services. You can configure services to appear as icons, text, or both. Some services have additional options to display smart buttons, such as Twitter, which will update the number of times the post has been shared.
You can enable this new service under your blog’s Settings menu and look for the new Sharing option. Here’s a short video to show you how it works: