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"Pay-per-click," by far the most popular form of online advertising, recently came under fire as charges of rampant "click fraud" gather steam on the Web.

It's pretty safe to say that anyone who has a computer has at some point or another used a search engine. Search engines are extremely useful creatures. They have had a major impact on our society, I mean its pretty amazing that you can just go type in anything you want into a search box and get back information about it in about two seconds.