The guys from StumbleUpon have launch a service called su.pr. It's basically a URL shortener, but with benefits:
- It can automatically post your URL to Twitter and Facebook
- It puts the URL into the StumbleUpon database, so that people will find it while stumbling
- It tracks clicks on the URL so that you can see how many people follow the link
It's a great way to either share an interesting site you found, or to promote your website. All you need is a StumbleUpon account, which you can easily sign up for, and away you go! Give it a try!