People Search, several sites now allows you to search people. I see them not more than a utilization for Google Search Engine but directed toward Social Networking sites and some google keyword utilization.
I see it much better than Pipl, and let Google dependent, multiple sources and aggregation to cull as much information as it can about a subject. In addition to indexing information from various news sites and social networks, Spock has a variety of notifications options available. Like 123people (below), Spock supports email notifications of changes to a person search, but you can also subscribe to an RSS feed for your search.
Pipl is tenacious people-search engine. Pipl's claim to fame is the depths to which it can plumb the "deep web" to find information. When you search for a person using Pipl, you're not limited to a simple white pages search. Pipl scours databases and indexes that standard search engines normally don't touch. If it's there to be found, Pipl returns all manner of things about the person you're searching for, including blog entires, photos, publications, donations on public record, profiles on social and business networking sites, and other overlooked sources. Pipl supports searching by name, username, phone number, and email.
123people has a broad reach, delving into blogs and public profiles to increase your chances of finding who you're looking for. 123people is a strong people-search engine, but one of the best pieces of functionality available to 123people searchers is its email notification feature, which sends out an email alert whenever the results of a specific search changes. It's a little heavy on the stalk-factor (though in a strange way not all that different from Facebook's newsfeed), but it saves you from wasting your time with fruitless return searches.
when the word "Search" mentioned Google pops up in our mind, So for sure you can search Google for people searching.