88.8% of participants in a July 2013 Toluna survey felt either neutral or positive about targeted ads and 42% of those surveyed rarely noticed them.
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I'm worried about my online security and privacy: how much do they know about me and do these ads have access to my computer?
You're not going crazy: many sites follow their users and show them ads to persuade them to come back, ideally with cash.
- that's usually because the advertiser is getting paid by the click and they've gone at it head on.
It's worth pausing at this point, however, to point out that the alternative to targeted ads is untargeted ads, which may be even more annoying.
But it's worth knowing that the way companies serve up targeted ads is growing ever more sophisticated: it's even possible for them to 'follow' users as they use the internet on different devices.