private function facebookLoginOrRegister($profile)
    {
        $em = $this->getDoctrine()->getManager();

        $user = $em->getRepository('HolostoreBundle:User\User')->findOneByMail($profile->getEmail());

        if(!is_null($user))
        // This email is known, the user is logged in
        {
            $user->setFirstName($profile->getFirstName());
            $user->setLastName($profile->getLastName());
            $user->setLastLoginDate(new \DateTime);
        }
        else
        // User is unknown, we create an account
        {
            $user = new User;

            // Generate credentials
            $username = $this->generateUsername($profile->getFirstName(), $profile->getLastName());
            $password = $this->generatePassword(uniqid());

            // Fill user datas
            $user->setMail($profile->getEmail());
            $user->setUsername($username);
            $user->setFirstName($profile->getFirstName());
            $user->setLastName($profile->getLastName());
            $user->setPassword($password);

            // Set metadatas
            $user->setActivated(true);
            $user->setFacebookAccount(true);
            $user->setFacebookId($profile->getId());

            $em->persist($user);
        }

        $em->flush();

        $token = new UsernamePasswordToken($user, $user->getPassword(), 'main', $user->getRoles());
        $this->get('security.token_storage')->setToken($token);
    }