Comment Re:define (Score 1, Insightful) 290
If that were so then Google could just show the ads randomly and besaid third parties had no way of ever finding out about their fraud.
Not true, for two reasons.
First, advertisers only pay if you click the on the ad. Advertisers can easily verify that the number of clicks Google claims corresponds to the number of hits their web site receives with a Google referral. There's some noise in that measurement, so the correlation isn't perfect, but it would be easy to see if it were systematically off.
Second, Google provides advertisers with extensive tools to help them determine how effective their ads are, or click "conversion rate", which boils down to revenue per click. Advertisers like Google because they can know exactly how effective their ad campaign is.
Note that I'm talking about Google's traditional method. In the last few years, Google has also acquired a (much smaller) business in "display" ads, in which Google gets paid per thousand ad "impressions". Even there, the advertiser can measure click-through effectiveness, though.
But it doesn't work that way. Besides, Google also sells data to the government, e.g. to law enforcement agencies.
Google does not sell any data to the government, or to law enforcement agencies. Google complies with proper, legal requests for data, as specified by law, but does not get compensated for fulfilling those requests. Google is a publicly-traded company, which means they have to file extensive financial reports detailing their incomes and expenses so if I were wrong you could easily prove it.
(Disclaimer: I work for Google but I'm not speaking in an official capacity. My job at Google is writing code. But everything I've said here has been stated repeatedly in public by people who are official spokespeople. In particular with respect to the government request question, see David Drummond's many public statements.)