Neat idea. I'm not sure that most users will think it's neat, though. It's not like shortened urls hanging around is a security risk to them. At least, I can't

Neat idea. I'm not sure that most users will think it's neat, though. It's not like shortened urls hanging around is a security risk to them. At least, I can't think of a downside. Scarcity is scary, though, and fear leads to alternate behavior. What I mean is that a user might think--I don't want this to expire! What if my friends come back in two weeks and can't click the link I send them? I guess creative uses could be releasing a url for a limited number of beta testers, or a limited offer. In both cases, however, you want website smarts, too. In the first example, you want the website to also be checking the number of beta testers who sign up in case the real url gets leaked. In the second, you still want to have a landing page that moves visitors to the new offer or something. I'd love to learn better uses for this. My first reaction was "not another shortener", but I feel empathetic to your idea now, even if I'm still lagging on coming up with creative, practical uses.