The only caution is that if you lose the password to an account, you need to be able to receive email at any email address you've ever confirmed on the account in order to reset it -- the fact that we don't collect a lot of personal information means that being able to receive email at an address you've previously confirmed is yours is the only way we can confirm you're the one who owns the account except in a few very rare situations that don't often apply. So if you lose access to an email address, be sure to update your accounts to your new email address as soon as possible to avoid the risk of forgetting the passwords and not being able to get back into the account.