Endless URL Shortening Redirection Loop

http://kb.mozillazine.org/Network.http.redirection-limit

All other browsers, to the best of my knowledge, have similar systems built in. So your premise is flawed: you can't have an "infinite redirect."

"This preference affects only HTTP redirects, not redirects with HTML meta tags or JavaScript." So if the shorteners use (or can be configured to use) different redirect methods, it might be possible to get around this limit.

However, you'd have to create a chain composed of shorteners each of which either doesn't recognize the next one on the list, or doesn't do any "security" checking at all.

All very good comments. It seems a LOT less likely to be able to do it than I originally thought.

Many will notice if a shortened url goes to another shortener and give a 'security notice'.

I don't think any modern browsers will redirect indefinitely.