I met someone online who used to work in the entertainment business as a child actress. I wouldn't call her famous, and I'd have to remind people what show she was on and when it aired. However, as a challenge I tried to find out as much as I could about her online. I started with a simple GOOGLE search and then went to free sites where public information was available.
I was stunned to discover how much information about a person is available online. Within two hours, I had her home address, personal phone number, names of possible relatives, the value of her home, and much more. If I were a stalker, I would have had everything I needed to invade her private life and appear at her doorstep. She has since taken steps to have her information removed from the Internet, but some things can't be removed, like property tax records and public phone listings.
As I said, I was not a stalker and I had no evil intentions towards this person. But people need to be aware of how easy it is for a disturbed person with Internet access to find them and their loved ones. She told me she had no idea all of that "private" information was published online.