Got this notification when I opened Chrome when coming back to my desk after lunch.
"We changed our privacy settings to allow us to snoop on what you're looking at and shove you ads accordingly. Feel free to opt out, but we'll probably opt you back in when you aren't paying attention."
true, but remember the ads are mostly subconcious. you often wont think about buying something after seeing an ad, but in the back of your mind you might have a slightly better opinion, or mental association to the brand. so next time you go to buy a product your more likely to remember that brand and buy from them. as much as i would like to believe otherwise, no-one is immune to propaganda