In the late 1990s advertisers naively paid for impressions, so spammers set up banner farms where they crammed as many banner ads as they could into a Web page and drew unwitting traffic to it. Some spammers went so far as to set up bouncing banner farms, where surfers who clicked through to one page fired off all the banners and then were redirected to another page where they fired off all the banners and then were redirected to another page....
After the dot-com meltdown, when banner ad revenues shrank faster than the commercial Web, Overture (now Yahoo! Internet Marketing) helped popularize the pay-per-click model. Google AdWords has made it extremely profitabl...
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