URL shortening services are Websites, which offer redirections from one of their pages with short URLs to your page (with a long URL). URL shortening services are great when you need to print URLs. I don't like them on Websites / in Emails as I can't see the target, but I don't want to type so much when I get a URL in my real live.
These services should be used more often in my university. It's ridiculous that all students have to note very long URLs in the first few days. It's not a real problem, but using URL shorteners would be better.
Long URL: https://lists.ira.uni-karlsruhe.de/mailman/listinfo/swt1-vorlesung (66 characters) Short URL: http://bit.ly/HKEKD0 (20 characters) Custom URL: http://bit.ly/SWT-List (22 characters, but you need to sign up for free)
Long URL: https://lists.ira.uni-karlsruhe.de/mailman/listinfo/swt1-vorlesung (66 characters) Short URL: http://tinyurl.com/87oscxb (26 characters) Custom URL: http://tinyurl.com/SWT-List (27 characters)
Long URL: https://lists.ira.uni-karlsruhe.de/mailman/listinfo/swt1-vorlesung (66 characters) Short URL: http://goo.gl/z5cp0 (19 characters) Custom URL: Not possible
This service is owned by Google.
Links do not expire and nobody can change them (source).
I think you can make a very simple list of quality properties of URL shorteners:
The user interface should be minimalistic. Goo.gl is a good example, bitly and tinyurl are still ok:
Choose your own name
If possible, the user should be able to choose the name of the short URL.
NEVER change short URL
Short URLs should live forever and never change.
- Adding '?preview' should give you a preview of the URL
- URL Toolbox: 90+ URL Shortening Services - if you wish to see some more
Did I miss quality measures?