Sharebar (http://wordpress.org/extend/plugins/sharebar) adds a vertical sharing bar to the left of each blog post that encourages readers to share your content on sites such as Facebook, Twitter, Google Buzz, StumbleUpon, Digg, and Reddit. You can also add custom buttons and let readers share by email. One of the advantages of Sharebar is that it's dynamic.
As a site visitor scrolls down a post to continue reading, the sharebar moves with the post, readily available. If the page is resized to less than 1000 pixels wide, the sharebar displays horizontally with smaller buttons designed to fit the space. Figure 7 shows an example of a vertical sharebar.
Figure 7 A scrolling sharebar is another way to encourage your readers to share your content.
If you prefer displaying share buttons at the bottom of your posts, consider the Share and Follow plugin, covered earlier in this article, or the ShareThis plugin (http://wordpress.org/extend/plugins/share-this).