When I first set up my AdSense account I make a custom channel and made it targetable. I don't think any Display Advertisers ever targeted me specifically. However, I have a new Adwords client and set up a Display campaign with one of the ad groups as placement targeting only and wanted to add my website. However, when I search for my site to add as a placement target, AdWords is basically saying site/placement not found. Anyone else experienced this? I'm guessing perhaps my site is NOT enough impressions to be found? I do think I found a way to manually add my site as the target.