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1.
A division of Google, and nothing else but a bunch of thieves. They offer to advertise on your site, and give you a share of mulah, letting your money build up. Then at the apex of your financial glory, they disable your account and "refund your money to the affected advertisers." AKA, you get jewed. Typically, they send you an e-mail with a bullshit reason saying your account is generating a risk of invalid activity, which may "financially hurt" advertisers (as though it will even scratch their surfaces). Google even has the nerve to say "thank you for your patience and understanding". Users are typically offered appeal forms, however, at the risk of not getting reinstated (or reinstated, then cancelled again) it isn't usually worth it.
Some people who have been shut down by AdSense have lost upwards of $3,000. Don't believe me? Then Google NCC Archives 219 and see what these happy people had to say.
by IsraelHands09 November 30, 2011
 
2.
An ageist monopoly advertising program. They are one of the only advertising programs that explicitly require the user to be over the age of 18, like many other services from Google. It is not known why, but even with this they are still a monopoly. They control about 80-90% of the internet advertising industry. If you dont believe me go and check. Using this service means you support ageist monopolies destroying the world. You are a sick sick person. Remember, there are always non ageist, non monopolistic options available from other companies.
Person 1: Google Adsense is literally destroying the world. I cant believe anyone would use them.

Person 2: Neither can I.
by God Hates Google December 30, 2008
 
3.
Google AdSense is an advertisement serving program run by Google. Website owners can enroll in this program to enable text, image, and more recently, video advertisements on their websites. These advertisements are administered by Google and generate revenue on either a per-click or per-thousand-impressions basis. Google is also currently beta-testing a cost-per-action based service.
-I've made lots of money with my website using Google's AdSense..
by Lich July 30, 2008