These ads, called retargeting ads, work by tracking people who visited a website and showing them ads as they browse elsewhere. A good number of internet users now use ad blockers, which means retargeting does not reach everyone. But for the people who do see them, the ads can still work because they are shown to someone who already showed interest. The challenge is that overusing them makes people feel watched, which creates a negative feeling toward the brand. So what do you think, do retargeting ads still have a real place in a modern marketing plan?