AndyA - 12:34 pm on Nov 30, 2010 (gmt 0)
This is called interest based advertising and you can deactivate it for your site. ;)
No, you can't. Clicking the box regarding interest based ads within your AdSense account only stops AdSense from using your site as part of your visitor's browsing history. Interest based ads based on your visitor's previous history will still be shown to those visitors while on your site.
Google apparently loves interest based ads. I visited a corporate website once to see what the company did, and they had Google Analytics on the site. Ads for that company followed me around for weeks afterward, and my interest in that company was ZERO, other than an old contact worked for the company. All those impressions were WASTED on me.
Just because a computer visited a site on robotic widgets doesn't mean the person at that computer a week later is interested in robotic widgets. Apparently, Google thinks this is the way to go though, since they sure love to show interest based ads based on sites visited weeks earlier.