123people

123people has a broad reach, delving into blogs and public profiles to increase your chances of finding who youre 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. Its a little heavy on the stalk factor (though in a strange way not all that different from Facebooks newsfeed), but it saves you from wasting your time with fruitless return searches.