When you create an account you can choose one of three different methods to sign up: Email, Google+, or Facebook.
It’s important that you always log in using the same method you used to sign up. Logging in using a different method will create a new account in your name, which may result in your original account being disabled.
If you've accidentally created more than one account, let our support team know here. Tell them which login method and email address you would like to keep and, in most cases, we will be able to merge all accounts for you.