The difference between billboards and Google Adwords is that advertisers do not pay based on the number of people who *look* at the billboard, unlike Google ads where the charge (if I understand correctly) is based on the number of clicks an ad gets. It is much easier to fraudulently modify the value/cost of a Google Ad than a billboard.
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The difference between billboards and Google Adwords is that advertisers do not pay based on the number of people who *look* at the billboard, unlike Google ads where the charge (if I understand correctly) is based on the number of clicks an ad gets. It is much easier to fraudulently modify the value/cost of a Google Ad than a billboard.