How to Prevent Identity Theft?

I have seen so many people that keeps posting their own personal/private identity via Facebook. Yes, I got it "bragging" of something they have accomplished in life, etc. But do we really need to take a picture of it, with the complete details and post on public sites? In fact, only those thieves that cares about those infos you have posted. Unfortunately, they are unaware of the risks that they are in. Documents that shows your identity or your child should not be posted on the internet publicly. Passports, licenses or ID's, green cards, phone numbers and home addresses should be fully protected at all times. I guess, they will learn somehow once they will get unexpected bills or someone's opening credit cards using their identifications that they have been sharing online. Folks, protecting valuable life informations is your own responsibility.