Just get a new email if you truly cannot remember. If you have notifications for that email, just sign up for some website and it should send it to you.
Try finding your iPad's location through your Google account. Usually, if you log in and look through the devices tab, you should be able to lock or unlock your iPad...
When attempting to sign in to Facebook, click "Forgot your account?" or "Can't log in?" at the top of the page, then follow the steps to recover your password. You'll...