John Carreras is President of Impact Displays, Inc, a company which provides Trade Show Displays, Exhibits, and Booths. His company uses paid search advertising, like Overture, to drive traffic to their site. Whilst at a trade show he noticed that all his competitors were there, he also found that his clickthrough traffic dropped by one-half to two-thirds of pre-show activity. Sure that this was not a coincidence he started to do some investigating. Read this interesting article, with accompanying spreadsheet!, to find out how he managed to identify and overcome this problem:How to Stop Click Fraud (Or at Least Get a Refund)
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