Hey guys, I just wanted to share this cool site with you.

http://waatp.com

It's a people-search-engine called WAATP. You can find anyone in the USA for free, only by typing thier name. They aggregates data from open sources such as social networks, web search engines and even offline sources, and their database is huge.
So, if you look for someone in USA, this is a right place to start your search.