It’s bound to happen sooner or later as the use of social networking sites increases (Close to 3.2 million Australians use Facebook).
Spokeo/hr trawls 40 odd social networking sites and brings up information of a person (after you keyed in an email address) available on various social network sites including Facebook, Myspace and Linkedin. It’s still early days for social network search, but tools like this are likely to get more sophisticated. Spokeo/HR is a paid service.
Another candidate search option is www.pipl.com , which does a very impressive job of finding people information available online. Unlike Spokeo which use email, Pipl use the name of the candidate to conduct a search. I am impressed with the results. Pipl is a free service.