Stumble Upon has now release a new URL Shortner service but it is different from other URL Shortner service.
Su.pr gives each shortened URL the potential for greatness. URLs can be seeded not only to Twitter and Facebook, but also into StumbleUpon's content pool where they can be discovered and promoted by its users. Su.pr brings the promise of a longtail from your link showing up as a related item.
Su.pr's stats tracking tools shows you how many times your link has been re-tweeted on Twitter, and given a rated review on StumbleUpon. It also breaks down traffic sources into the people who click on the link and from outside of StumbleUpon.organic traffic from the site.
The service will also let publishers use the shortening service such that it will yourdomain/XXX. Each URL you link to is automatically shortened. It does this while maintaining a special domain re-direct that allows search engines to pick up on those source links, even though they've been shortened.
It still in private beta and can be accessed via an invitation. Still waiting for one..
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Stumble Upon Su.pr - URL Shortner With Massive Traffic
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