A friend who uses Chrome just told me that AdSense ads are not showing up in her Chrome browser. I asked her if she had an ad blocker on. She checked, and told me that it was. She disabled it and then the AdSense ads appeared. Is ad blocker the default setting in Chrome? As AdSense and Chrome are owned by the same people, you would not think that the ad blocker on would be the default. That doesn't make any sense at all.