Your search for usernames returned 2 results.
Twitter Does NOT Retire Usernames
Grabbing yourself the ultimate Twitter username is the most infuriating process ever, which makes sense with over 554M registered Twitter accounts. But what if you find a username that you want, and it's clearly not being used? Well, you contact Twitter through their Help Center and ask them about it, only to receive a canned response. It's also posted here. The response looks like this...
Twitter and TV/online Video Integration Tips