Cos, you know, twitter is pretty pooptastic.
Answer on How do i delete a twitter account?
To deactivate your account:
1. Log in to Twitter
2. Click Settings
3. Click 'deactivate my account' at the bottom of the page
4. Enter your password when prompted. (Without the correct account password, you will not be able to deactivate an account.)
5. Verify that you really want to do it and voila, it's done.
