I both earn money from AdSense and pay Google for ad space – so seeing a terrible looking ad on my blogs and getting exposure hurts. If you do visit a couple of Australian food blogs, eventually you’ll be served up with this diet ad – as Simon mentions over at his site:

You might build a beautiful, minimalist site and advertisers ruin it with an ad that may well have been drawn by their own child. If you’re a food blogger, you generally get served bad ads from Adsense because the price that advertisers pay is based on (amongst other things) the competition for the keywords that you use on your site. In Australia, there is virtually no competition for food-related keywords and so food-related sites tend to attract the bottomfeeders who will pay 5 cents a click for any traffic that they can hoover up.

If you don’t want to see that ad on your site, login to Adsense, go to Adsense setup > Competitive Ad Filter and block them. It’s that easy.

Then sign up for the AdSense Ad Review Centre and filter out the entire categories of Cosmetic Procedures & Body Modification, Drugs & Supplements, Get Rich Quick, Weight Loss; and any of the other spammy categories that you choose. You’ll probably take a hit to your revenue and it won’t stop everything but it will serve up a better experience to your audience.