I’m Su.Pr, thanks for asking!
Based off this video, Su.Pr is primed to be the go-to micro-blogging/URL Shortening/ Distribution tool for Web Video creators. The tool appears to be useful in strategically releasing links, tracking them, and compelling more “likes” on Stumble Upon and facebook, all of which boils down to an easier, more efficient way of distributing links to your network. If Stumble Upon is looking for a way to gain leverage in the media sharing market, creating enticing tools for those who create content seems like a great strategy. I’m sold.
The dev team appears to be releasing a few hundred invites every couple days via Twitter, so following them seems to be the smartest way to snag an invite.
Via Laughing Squid
Update: Just moments after posting this blog, Laughing Squid released a few more beta invites. I’ll let you know how it goes.