Tr.im closed it’s doors for a few days and this caused all sorts of ballyhoo because (it seemed at the time) all those links would soon point to diddly squat. Daring Fireball says, “and people ask me why I wrote my own URL shortener for DF’s Twitter account.” Have you written your own Gmail, Facebook, Flickr, etc.? Please help me to see the difference between a url shortening service and any other thing on the web on which you have data.