Nice DoS vector; all I have to do is claim I'm foo.com on Twitter, then I just tell foo.com's host to fuck themselves, and then foo.com is gone forever. It also sounds like a good way to cancel unwanted credit cards. Instead of waiting on hold for hours to talk to high-pressure "you don't really want to cancel, do you" guy, just tell your bank to fuck themselves on Twitter, and your account magically goes away.
Somehow I feel I'm missing something here...