1. User presses the LinkedIn authentication button in the navbar, login page or registration page.
2. User allows the application to access his LinkedIn information.
3. User is asked to specify a username.
4. System registers and activates the account. The User is logged in.

2.
    a. User has already registered with his LinkedIn account.
        1. User is logged in.
    b. There is already an activated account using the User’s LinkedIn email.
        1. The account is associated with the User’s LinkedIn account.
        2. The User is logged in.

2.
    c. Account had already been registered and has been banned.
        1. User is notified that his account has been banned.