[Neil]

email is because its how you log in. I have more than one in because a while ago Rhonda had a problem where her password was screwed up and she could not log in. The password resets are sent as an email but our provider was bining emails from facebook and nothing they could do would let the emails come through. Thats why we both have home and work emails on. Mine are set so only I can see them. Dont know how Rhonda has hers set. Probably so only friends can see it. After all if you only have people you class as friends then whats the problem.

As for mobile number they can reset your password by sending a code to your mobile. They can sent notifications to your mobile and you can use your mobile to update your status.

I dont put my work details in. I know people who have been in trouble for posting work things before