Getting Paranoid about the Internet

I am getting more paranoid about the internet. It could be because I have been reading about kidnappings. It could be because I am becoming a more private person. It could be because I am afraid of creepy people stalking our family.

Should we delete all our photos from the internet? People can upload photos of us on facebook and we wouldn't even necessarily know. I have heard that once something is on the internet it is there forever.

There is so much public information available online, which is scary too. What about privacy? If I am concerned about privacy, why even have a blog? Should we delete it?