Blast from the past: Pop-unders are back in vogue for ads

In the old days, pop-under ads were a scourge of the web. Now, since fraud fighters have improved their ability to detect bots, some sites are turning back to pop-unders to show ads to unsuspecting humans. By inserting separate browser windows behind what users are viewing, these websites display ads that are often unseen even though they are registered to a human user.Read the full article

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