If the results of an engine search such as Google don't turn up enough information, you can try searching the most popular social networking sites, such as Facebook.com, and specific people search websites, such as Pipl.com. Additionally, you can find information searching through public records available online.
Social networks such as Facebook, Twitter, Linkedin and MySpace may help you find a person on the Internet, especially if the person you are looking up chooses to not have his public profile appear in search engines. Try searching with the full name or address, and then narrow the results using the search options and filters each networking site provides, such as location, hometown and education. The search engine Wink.com helps you search all the major social networks at the same time.
Additionally, you may use websites designed specifically to perform people searches, such as Pipl.com and ZabaSearch.com. There are also online white pages where you can look someone up, using his name and other details, if that person's number is listed.
Additionally, there are some government resources that give you access to public records. Usa.gov, for example, is a search portal that can give you direct access to searchable information from the United States government.