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CNN Money, By: Dan Mitchell
Those weird little ads on the right side of your Facebook page—the ones depicting ugly shoes or pitching iffy continuing education degrees—are partly the result of the changing economics of both spam and online advertising in general.
Email spam became a huge business—and a huge problem for both Internet users and network managers—because marginal costs are near zero. Once a sleazy pitch for gray-market Viagra or a porn site is written, the additional cost of each spam message sent is almost nothing. Sending out millions of emails doesn't cost much more than sending out just one. Very few people fall for the usually scammy offers, so sending them in bulk is necessary to actually snag paying customers.
But improvements to spam-blocking technologies, together with ever-cheaper "legit" advertising have worked to decrease email spam, according to a report from Kaspersky Lab, a maker of antivirus software. "With the emergence of Web 2.0," the report states, "advertising opportunities on the Internet have skyrocketed: banners, context-based advertising, and ads on social networks and blogs."
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