How to protect your orkut account

I was asked by many people to tell me the way to protect your orkut account.PLese reply and show your feed backThis Simple Tutorial will Save you from Spam mails and Hacking Tricks used by Many hackers.As you know you can hide your primary email address from non-friends but if by mistake you add a unknown person to your friend list, then he/she will be able to see your primary email address which