My parents would never think of snooping into my private matters, it just wasn't done the way they were brought up. There were certain things that just weren't discussed in polite circles according to my mother and with my father everything was black and white.
It wasn't until we were mostly grown that we were able to discuss things with my father, and just danced around other subjects with my mother.
I have a standard policy that all my nephews and nieces know that they can come talk to me, or call me or write to me about anything. I will not judge them, I will counsel them if I feel it is necessary, and will definitely get them whatever help they need if they are in trouble. I treat my friends the same way, I take people at face value until I am proven wrong.
Just remember, that in the case of children, you are the adult/parent. Not their bestest friend ever, certain ground rules have to be in place. And children need to be taught the consequences of their own actions. Sometimes it is a painful lesson to learn for both the parents and the child.
As to kids being on MySpace, FaceBook or any of those other things like that, that is something I feel needs to be closely monitored by parents. Too many pervs are out there looking to prey on susceptible children, and to many kids have used those things to bully and harass other children without restraint. In some cases it has even resulted in suicide or suicide attempts.
Okay, back to hooking now, end of my homily.