Short links are not pages on our site, they are stored in a database that robots have no general access to. And if I was using Twitter.com to Tweet as I sometimes do, then I wouldn’t use one, I’d just let Twitter shorten it. For example, if you send out weekly newsletters, this might be "newsletter".
UA code is the unique identifier for each Analytics account you create. See if you are using Classic Analytics (ga.js) or Universal Analytics (analytics.js).