The Internet (including the so-called hidden- or deep-web) already provides a plethora of open-source information on just about everyone--like it or not. Whether you're doing a pre-emptive vanity search to check your own background, investigating a perspective employer/employee, or searching for a long-lost relative you'll find an amazing amount of tools available here.
This site is not intended to be a replacement for a private investigator or an attorney, nor should it be used for any illegal purposes (pursuant to the use agreements of the sites linked here).
Please note that if you find any errors, changes, or glaring omissions on this site I would appreciate an e-mail at Cyber.Researcher@gmail.com. Your input is important and I strongly believe that the community can make IIT a more useful resource for everyone.
Yours in Search,
P.S. Please note that I am only just beginning to post the current list of resources and I appreciate your patience. Feel free to let me know your favorite resources using the address above.