We only ever reclaim a kt.tn URL if it does not belong to anybody, and it has never been used. URLs that are created via our application programming interface, without a username and password, for example, are not owned by anybody.
If you create a kt.tn URL within your kt.tn account, we will never delete it, whether it has ever been visited or not. Once you create it, you own it. Simple.
In a word, yes. All statistics presented for a kt.tn URL are unique to that URL. Every time a redirection request comes in, we record a variety of information -- the time, the unique Internet address for the requesting computer, where they came from -- and save a single record of that redirection. We then use these event records to create the statistical summaries. They only exist for the single kt.tn URL in question.
Some URL shorteners are setup such that users without accounts share links: they will each get the same URL for a given destination URL. kt.tn does not do this.
Yes! Some Twitter clients such as Twitcher or Hotot allow for kt.tn support and to enter your kt.tn account in their preferences. Without your kt.tn username and password we cannot attach your kt.tn URLs to your account when you create them. But what if a Twitter client does support kt.tn, but does not allow to enter your kt.tn credentials? Or if you decide to better not give a certain application your kt.tn credentials? Here at kt.tn, we respect your decision. Our solution to this is »kt.tn URL Claiming«.
Anytime you share an URL on Twitter with an account that you configure with kt.tn, we will see it after a while, and attach it to your account automatically if it is not already owned by anyone else. You can configure a Twitter account for URL claiming under Account > URL Claims.
Some URL shorteners will never be able to do this because their publicly created URLs are not unique: they are shared by many, many users. All kt.tn URLs, however, are unique. So, any URL that we find in your Twitter status stream and can attach to your account will still have its statistics intact, and unique to your usage of that URL.