If you want to do a people search, you may try Pipl, which is a service which collect people’s public profile from social network service.
By using Pipl, users can know others public profiles easily by just provide the person’s first name, last name, city, state, and country. Pipl’s query-engine helps you find deep web pages that cannot be found on regular search engines.
The main reason why Pipl is better than traditional search engine is because normally the people-related documents and profiles are stored in databases and not a static page, so they are invisible to search engine. A lot of informations are come from social network service, which is public profiles. Pipl collect them and store in their system.