The Twitter for iPhone app (itunes) can be configured to use your very own Firefly URL shortener! Here’s how.
~ Actually, it’s quite simple. First, setup your own Firefly instance, possibly using Heroku.
When that’s done, simple open Twitter for iPhone, then follow this path:
Tap the three dots Open “Accounts & Settings” Tap the “Settings” button at the bottom Open “Services” Choose “URL Shortening” Then pick “Custom…” All right, you’re now ready to enter your magic URL.