How can we balance freedom and security?

I think that myspace is blocked and facebook is not because myspace is like and open site and there is really no way to keep your information secure. On facebook you can easily get your account deleted. Also there are alot of crazy people that have myspace and since there are many people on there lyin about their age then the young ones will probably want to meet the people that they are talkig to and that's how bad things happen.