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You might want to stop searching for cute photos of cats unless you want to get bombarded with PETA ads. Google is rolling out a new feature for its advertising network called "Interest-Based Advertising," (also known as behavior targeting) which will tailor ads for users based on browsing and search histories. "Previous interaction" ads will also aggravate the easily-tempted—if you browse, but do not purchase items on shopping sites, future ads will remind you of the products. To be fair, Google allows users to control their privacy settings and opt-out of future sidebar notices, while Yahoo and AOL have similar systems in place without the same consideration.