Yup!
Go to the "Account" menu (top right of the screen) and select "Account Settings". At the bottom, you will see "Deactivate Account". Select this and you will get a few screens trying to convince you to stay. When you get through this, you are told you have 14 days in which to reactivate the account should you wish. If you don't, the account will be deleted. Good luck. ;)
G x