Use the API to create URLs outside of the standard website forms. With on the main site, you can it and tweet it to Twitter in the same action. Also on the main site, after you log in, you can view all your URLs since the time that you signed up. With the API, you can shorten URLS, submit a custom URL that you prefer to an auto-generated URL, insert tag words to the URL, submit usernames and passwords to attach to the generated URL, and get a list of the domain names currently configured as domain name shortening services that will not allow to be in the destination URL.