It's weird, nobody used this feature so far. Either we do a good job moderating ads and publishers don't want to ban them, or they just didn't notice this feature.
Hmm, I don't see a way to see where you got traffic from.
There is Traffic Sources -> Exclude, but this list ins't sorted, so it's pretty much impossible to get useful information out of it.
Thanks for your feedback!
It is sorted by clicks so that you can ban ad units that generate too much useless traffic for your site.
Here are the current means for advertiser to get to know where his traffic comes from:
1. If you enable "Goal tracking" option in the "Info" tab of your campaign then you will get ID of traffic source with every visitor (so you can track on your side which traffic sources attract useful traffic).
2. In the advertiser's "Targeting" tab you can see the categories and quality range of ad units for your campaign. You can check
catalog to check what's inside.
3. You can just visit any ad unit and see if your ad is there and what's the percentage of its traffic you get. E. g. here is the list of advertisers for ad unit #1:
http://a-ads.com/ad_units/1/campaignsIf you have a specific use case/interface in mind, please describe it, we plan to improve it.