It's a lame move from both tumblr and the company zephoria. Here I'd like to ask if anoyone heard of twitter stealing one's username? I was once very surprised

It's a lame move from both tumblr and the company zephoria. Here I'd like to ask if anoyone heard of twitter stealing one's username? I was once very surprised finding that http://twitter.com/#!/bmw http://twitter.com/#!/bmw is used by some guy, while the company uses other twitter accounts http://twitter.com/#!/search/users/bmw http://twitter.com/#!/search/users/bmw and I wonder if they even tried to get the username.