This should be easy to implement by a password given only to the people one chooses to allow to follow the trades. I have 2 people already wanting to do this and I'd rather do this through this site than through MT4's signals.
It would also be a nice feature if you could 'customize' the rate of earnings, with the autotrader's follower approval, in a per user basis. As an example, I could make higher earnings on friends and none on my mother... 😄