When Do you block them?
I've read a lot of threads about blocking Ads. When and how do you do that?
You block ads when your topic is b2b, content targeted to women age 30-55, and the ads are borderline porn, having absolutely nothing at all to do with the page topic or content, with ad copy advertising sexy photos of single seniors. That is when you block them.
When the ads showing on your pages no longer enhance the content, and the content of those ads would drive away traffic, it is time to block. No amount of cpc is worth degradation of a site.
If you have alot of those and block alot of those, and instead of Adsense ads they are YPN ads, you can expect the ads to show up inspite of being blocked. So, then you pull the YPN off the page, put Adsense back on, and move on.
I block them when I see the "free" and "reward" site ads springing up on my pages. I'm targeting consumer electronics, so they are very common.
There are some free services on the internet that specifically test these domain names for bad practices - one of them being a spam test. I noticed that most of these sites, if my visitors were unlucky enough to sign up, were sending 100-200+ spams per week to test email boxes that were set up. I don't want my visitors to ever have to experience that - even if it would be their own damn fault - so I block them.
I have a feeling they pay rather low, as well.
Also, any sites that claim to have found the "top" or "best" x number of sites about a topic - usually block those as well, wihtout question. I want my visitors to eventually land on product pages.
How do you block them?
Click on the Competitive Ad Filter tab when you are in the AdSense Setup area.
Follow the instructions.
As the above posters made clear, you can use the filter to block any ads by URL, not just competitive ads.
I block debt collection agencies, bailiffs, scum like that.
If it's not selling a product or service I block (if it's persistant). I don't block ads the first time I see them or the filter clogs up too fast.
If the site offers genuine information that I think my visitors would be interested it stays. If it's simply wall to wall ads it goes.