Intelius - Dont' waste your money
My experience is similar to other reviewers. I gave them a social security number, and they gave me a worthless report consisting mainly of people who happen to have a similar name to the person for whom I was searching.
I filled out their email form to register a complaint, but never received a response.
Another nice touch is that they will try to get you to sign up for some identity theft protection service, and they make this service look like it's part of the registration process. It's not.
This was a complete waste of fifty dollars.