If you signed up using Google and if your Facebook and Google accounts have been created with the same email id , you CAN login with Facebook too. Note that in this case you cannot login with your email id and password.
If you signed up using Facebook and if your Facebook and Google accounts have been created with the same email id , you CAN login with Google too. Note that in this case you cannot login with your email id and password.
If you sign up using your email id and password, and if your Facebook and/or Google accounts have been created with the same email id, you can login using Facebook and/or Google.