With JEFIT you are now able to log into JEFIT and link your current profile with Facebook.
Logging In With Facebook
When you first open up JEFIT (either from a fresh install or logging out and re-logging back into your account)
From the main login page, you will select the option "Log In With Facebook", to create and log into an account using your Facebook Profile.
Once you log in with Facebook, you will be able to track stats, record logs, upload pictures and more