here here :
If you do not like contextual advertising, it is very easy to change it. I do this: I enter the search engine something like "meancoons feed", I go to a couple of pet sites - and all, you have a cat in all contextual fields! Don't forget - "the invisible hand of the market is made of delicious invisible meat" (c) xkcd
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If you do not like contextual advertising, set yourself an adblock, and you will be lucky. A lot of happiness. Tested, the result is 100%!