WordPress.org

Automatically generates a short url using your account at bit.ly and insert links to share it at the bottom of your posts and pages, you can also disable the links to appear in specific posts/pages.

On each post page in the backend, you can also keep track of the clicks for each post with a link to extended statistics in the bit.ly page.

If you have the sociable plugin activated, this plugin will replace the default link with the short url automatically.